diff --git a/groups.json b/groups.json
new file mode 100644
index 0000000..cfe4052
--- /dev/null
+++ b/groups.json
@@ -0,0 +1,7 @@
+{
+  "groups": [
+    {"title": "Programmers"},
+    {"title": "Managers"},
+    {"title": "Testers"}
+  ]
+}
diff --git a/pom.xml b/pom.xml
new file mode 100644
index 0000000..f719a92
--- /dev/null
+++ b/pom.xml
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>org.example</groupId>
+    <artifactId>Deanaery</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>RELEASE</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.googlecode.json-simple</groupId>
+            <artifactId>json-simple</artifactId>
+            <version>1.1.1</version>
+        </dependency>
+    </dependencies>
+
+
+</project>
diff --git a/src/main/java/Deanery.java b/src/main/java/Deanery.java
new file mode 100644
index 0000000..9489417
--- /dev/null
+++ b/src/main/java/Deanery.java
@@ -0,0 +1,149 @@
+import org.json.simple.parser.JSONParser;
+import org.json.simple.JSONArray;
+import org.json.simple.JSONObject;
+import org.json.simple.parser.ParseException;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.ArrayList;
+import java.util.Random;
+
+public class Deanery {
+    ArrayList<Student> students;
+    ArrayList<Group> groups;
+
+    Deanery() {
+        this.students = new ArrayList<Student>();
+        this.groups = new ArrayList<Group>();
+    }
+
+    public void importStudents(String fileName){
+        try{
+            Object obj = new JSONParser().parse(new FileReader(fileName));
+            JSONObject jo = (JSONObject) obj;
+            JSONArray stud = (JSONArray) jo.get("students");
+            Iterator studItr = stud.iterator();
+            int id = 1;
+            while(studItr.hasNext()){
+                JSONObject buf = (JSONObject)studItr.next();
+                Student temp = new Student(buf.get("fio").toString(),id);
+                students.add(temp);
+                id++;
+            }
+        }
+        catch(FileNotFoundException e){
+            System.out.println(e.getMessage());
+        }
+        catch(IOException e){
+            System.out.println(e.getMessage());
+        }
+        catch(ParseException e){
+            System.out.println(e.getMessage());
+        }
+    }
+
+    public void importGroup(String fileName){
+        try{
+            Object obj = new JSONParser().parse(new FileReader(fileName));
+            JSONObject jo = (JSONObject) obj;
+            JSONArray grp = (JSONArray) jo.get("groups");
+            Iterator grpItr = grp.iterator();
+            int len = 0;
+            int i = 0;
+            int j = 0;
+            int d = students.size() / grp.size();
+            while(grpItr.hasNext()){
+                len += d;
+                JSONObject buf = (JSONObject)grpItr.next();
+                Group temp = new Group(buf.get("title").toString());
+                groups.add(temp);
+                for (; i < len; i++){
+                    groups.get(j).addStudent(students.get(i));
+                }
+                j++;
+            }
+        }
+        catch(FileNotFoundException e){
+            System.out.println(e.getMessage());
+        }
+        catch(IOException e){
+            System.out.println(e.getMessage());
+        }
+        catch(ParseException e){
+            System.out.println(e.getMessage());
+        }
+    }
+
+    public void addMarksForAll(){
+        float markCount = 100;
+        for (Student student: students){
+            Random random = new Random();
+            for (int i = 0; i < markCount; i++){
+                student.addMark(random.nextInt(5) + 1);
+            }
+        }
+    }
+
+    public void headInitialize(){
+        for (Group group: groups){
+            group.chooseHead();
+        }
+    }
+
+    public void transferStudent(int id, String newTitle){
+        Student tempStud = null;
+        for (Group group: groups){
+            if (group.searchStudentId(id) != null){
+                tempStud = group.searchStudentId(id);
+                group.removeStudent(tempStud);
+            }
+        }
+        for (Group group: groups) {
+            if (group.title == newTitle){
+                group.addStudent(tempStud);
+            }
+        }
+    }
+
+    public void deductStudent(){
+        double minAvgMark = 2.5;
+        for (int i =0; i < students.size(); i++){
+            if (students.get(i).averageMark() < minAvgMark){
+                students.get(i).group.removeStudent(students.get(i));
+                students.remove(students.get(i));
+                i--;
+            }
+        }
+    }
+
+    public void writeToFile(String fileName){
+        try{
+            FileWriter fwriter = new FileWriter(fileName);
+            JSONArray groupsJA = new JSONArray();
+            for(Group group: groups){
+                JSONObject groupJsn = new JSONObject();
+                groupJsn.put("groupTitle", group.getTitle());
+                groupJsn.put("groupAverageMark", group.averageMarkGroup());
+                groupJsn.put("headStudent", group.getHead().getFio());
+                JSONArray studentJA = new JSONArray();
+                for (Student student: group.getStudents()){
+                    JSONObject studentJsn = new JSONObject();
+                    studentJsn.put("studentId", student.getId());
+                    studentJsn.put("studentFIO", student.getFio());
+                    studentJsn.put("studentAverageMark", student.averageMark());
+                    studentJA.add(studentJsn);
+                }
+                groupJsn.put("students", studentJA);
+                groupsJA.add(groupJsn);
+            }
+            fwriter.write(groupsJA.toJSONString());
+            fwriter.flush();
+            fwriter.close();
+        }
+        catch (IOException e){
+            System.out.println(e.getMessage());
+        }
+    }
+}
diff --git a/src/main/java/Group.java b/src/main/java/Group.java
new file mode 100644
index 0000000..f5a5110
--- /dev/null
+++ b/src/main/java/Group.java
@@ -0,0 +1,71 @@
+import java.util.ArrayList;
+import java.util.Random;
+
+public class Group {
+    String title;
+    public ArrayList<Student> students;
+    private Student head;
+
+    Group(String groupMame){
+        this.title = groupMame;
+        this.students = new ArrayList<Student>();
+        head = null;
+    }
+
+    public void addStudent(Student student){
+        this.students.add(student);
+        student.addGroup(this);
+    }
+
+    public Student chooseHead(){
+        if (students.size() > 0 && this.head==null) {
+            Random rndm = new Random();
+            this.head = students.get(rndm.nextInt(students.size()));
+        } else {
+            return head;
+        }
+        return null;
+    }
+
+    public Student searchStudentName(String name) {
+        for (Student student: this.students){
+            if (name == student.getFio()){
+                return student;
+            }
+        }
+        return null;
+    }
+
+    public Student searchStudentId(int id) {
+        for (Student student: this.students){
+            if (id == student.getId()){
+                return student;
+            }
+        }
+        return null;
+    }
+
+    public double averageMarkGroup(){
+        float general = 0;
+        for (Student student: students){
+            general += student.averageMark();
+        }
+        return general / students.size();
+    }
+
+    public void removeStudent(Student student){
+        students.remove(student);
+    }
+
+    public String getTitle(){
+        return this.title;
+    }
+
+    public Student getHead(){
+        return this.head;
+    }
+
+    public ArrayList<Student> getStudents(){
+        return this.students;
+    }
+}
diff --git a/src/main/java/Student.java b/src/main/java/Student.java
new file mode 100644
index 0000000..a850c88
--- /dev/null
+++ b/src/main/java/Student.java
@@ -0,0 +1,40 @@
+import java.util.ArrayList;
+
+import java.util.ArrayList;
+
+public class Student {
+    private int id;
+    private String fio;
+    protected Group group;
+    protected ArrayList<Integer> marks = new ArrayList<Integer>();
+
+    Student(String fio, int id){
+        this.fio = fio;
+        this.id = id;
+    }
+
+    public String getFio(){
+        return this.fio;
+    }
+
+    public int getId(){
+        return this.id;
+    }
+
+    public void addMark(int mark){
+        this.marks.add(mark);
+    }
+
+    public double averageMark(){
+        float general = 0;
+        for (Integer integer: marks){
+            general += integer;
+        }
+        return general / marks.size();
+    }
+
+    public Group addGroup(Group group){
+        this.group = group;
+        return group;
+    }
+}
diff --git a/src/main/java/main.java b/src/main/java/main.java
new file mode 100644
index 0000000..efea35e
--- /dev/null
+++ b/src/main/java/main.java
@@ -0,0 +1,14 @@
+import java.io.File;
+
+public class main {
+    public static void main(String[] args) throws Exception {
+        Deanery deanery = new Deanery();
+        deanery.importStudents("students.json");
+        deanery.importGroup("groups.json");
+        deanery.headInitialize();
+        deanery.addMarksForAll();
+        deanery.transferStudent(15, "Managers");
+        deanery.deductStudent();
+        deanery.writeToFile("result.json");
+}
+}
diff --git a/src/test/java/DeaneryTest.java b/src/test/java/DeaneryTest.java
new file mode 100644
index 0000000..70c6ad0
--- /dev/null
+++ b/src/test/java/DeaneryTest.java
@@ -0,0 +1,57 @@
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class DeaneryTest {
+    Deanery deanery = new Deanery();
+    Group group1 = new Group("Programmers");
+    Group group2 = new Group("Manager");
+    Group group3 = new Group("Testers");
+    Student student1 = new Student("Иволгин Гаврила Казимирович", 1);
+    Student student2 = new Student("Челомцев Кир Егорович", 2);
+    Student student3 = new Student("Морякова Стела Рубеновна", 3);
+
+    @Test
+    public void headInitialize(){
+        Student s1 = student1;
+        Student s2= student2;
+        Student s3 = student3;
+        group1.addStudent(student1);
+        group2.addStudent(student2);
+        group3.addStudent(student3);
+        deanery.groups.add(group1);
+        deanery.groups.add(group2);
+        deanery.groups.add(group3);
+        deanery.headInitialize();
+        assertEquals(s1, group1.getHead());
+        assertEquals(s2, group2.getHead());
+        assertEquals(s3, group3.getHead());
+    }
+
+    @Test
+    public void addMarksForAll(){
+
+        deanery.students.add(student1);
+        deanery.students.add(student2);
+        deanery.students.add(student3);
+        deanery.addMarksForAll();
+        assertNotNull(student1.marks);
+        assertNotNull(student2.marks);
+        assertNotNull(student3.marks);
+    }
+
+    @Test
+    public void transferStudent(){
+
+        group1.addStudent(student1);
+        group2.addStudent(student2);
+        group3.addStudent(student3);
+        deanery.groups.add(group1);
+        deanery.groups.add(group2);
+        deanery.groups.add(group3);
+        deanery.transferStudent(3, "Manager");
+        assertEquals(1, deanery.groups.get(0).students.size());
+        assertEquals(2, deanery.groups.get(1).students.size());
+        assertEquals(0, deanery.groups.get(2).students.size());
+    }
+}
diff --git a/src/test/java/GroupTest.java b/src/test/java/GroupTest.java
new file mode 100644
index 0000000..8e04ffa
--- /dev/null
+++ b/src/test/java/GroupTest.java
@@ -0,0 +1,43 @@
+import org.junit.Test;
+
+import java.util.ArrayList;
+
+import static org.junit.Assert.*;
+
+public class GroupTest {
+    Group group = new Group("Manager");
+    Student student1 = new Student("Иволгин Гаврила Казимирович", 1);
+    Student student2 = new Student("Челомцев Кир Егорович", 2);
+    Student student3 = new Student("Морякова Стела Рубеновна", 3);
+
+    @Test
+    public void checkGetHead(){
+        group.addStudent(student3);
+        group.chooseHead();
+        assertEquals(student3, group.getHead());
+    }
+
+    @Test
+    public void checkAverageMarkGroup(){
+        group.addStudent(student1);
+        group.addStudent(student2);
+        student1.addMark(3);
+        student1.addMark(3);
+        student1.addMark(3);
+        student2.addMark(5);
+        student2.addMark(5);
+        student2.addMark(5);
+        assertEquals(4.0, group.averageMarkGroup(), 0.001);
+    }
+
+    @Test
+    public void checkRemoveStudent(){
+        group.addStudent(student1);
+        group.addStudent(student2);
+        group.removeStudent(student2);
+        ArrayList<Student> expectedStudents = new ArrayList<Student>();
+        expectedStudents.add(student1);
+        assertEquals(1, group.students.size());
+        assertEquals(expectedStudents, group.students);
+    }
+}
diff --git a/src/test/java/StudentTest.java b/src/test/java/StudentTest.java
new file mode 100644
index 0000000..5b5af96
--- /dev/null
+++ b/src/test/java/StudentTest.java
@@ -0,0 +1,42 @@
+import org.junit.Test;
+
+import java.util.ArrayList;
+
+import static org.junit.Assert.*;
+
+public class StudentTest {
+    Student student1 = new Student("Морякова Стела Рубеновна", 1);
+    Student student2 = new Student("Челомцев Кир Егорович", 2);
+    Student student3 = new Student("Рыжанова Нелли Петровна", 3);
+
+    @Test
+    public void checkGetIdFio(){
+        assertEquals(1, student1.getId());
+        assertEquals("Морякова Стела Рубеновна", student1.getFio());
+    }
+
+    @Test
+    public void checkAddMark(){
+        student2.addMark(3);
+        student2.addMark(4);
+        student2.addMark(5);
+        student2.addMark(2);
+        ArrayList<Integer> expectedMarks = new ArrayList<Integer>();
+        expectedMarks.add(3);
+        expectedMarks.add(4);
+        expectedMarks.add(5);
+        expectedMarks.add(2);
+        assertEquals(expectedMarks, student2.marks);
+    }
+
+    @Test
+    public void checkAverageMark(){
+        student3.addMark(2);
+        student3.addMark(4);
+        student3.addMark(5);
+        student3.addMark(2);
+        assertEquals(3.25, student3.averageMark(), 0.001);
+    }
+
+
+}
diff --git a/students.json b/students.json
new file mode 100644
index 0000000..ed76ce5
--- /dev/null
+++ b/students.json
@@ -0,0 +1,44 @@
+{
+  "students": [
+    {"fio": "Саитов Олег Еремеевич"},
+    {"fio": "Иволгин Гаврила Казимирович"},
+    {"fio": "Парфёнов Парфен Панкратиевич"},
+    {"fio": "Лекомцев Ефрем Саввевич"},
+    {"fio": "Копылов Мечислав Евсеевич"},
+    {"fio": "Бичурин Порфирий Иванович"},
+    {"fio": "Челомцев Кир Егорович"},
+    {"fio": "Лукашенко Максимильян Ильевич"},
+    {"fio": "Мукосеев Ираклий Елисеевич"},
+    {"fio": "Кожевников Венедикт Юриевич"},
+    {"fio": "Морякова Стела Рубеновна"},
+    {"fio": "Шеркова Берта Арсентиевна"},
+    {"fio": "Поджио Инга Эдуардовна"},
+    {"fio": "Шайна Вера Ивановна"},
+    {"fio": "Задорожная Диана Серафимовна"},
+    {"fio": "Еромеева Евдокия Агафоновна"},
+    {"fio": "Тарновецкая Наталия Ростиславовна"},
+    {"fio": "Шигаева Кристина Михеевна"},
+    {"fio": "Голубова Марта Сидоровна"},
+    {"fio": "Кондр Яна Карловна"},
+    {"fio": "Калугер Любава Данилаивна"},
+    {"fio": "Шеншина Изольда Платоновна"},
+    {"fio": "Гущина Рената Захаровна"},
+    {"fio": "Лавлинская Лариса Германовна"},
+    {"fio": "Яковенцева Евдокия Тимофеевна"},
+    {"fio": "Касьяненко Валентина Ивановна"},
+    {"fio": "Андреевская Ярослава Пахомовна"},
+    {"fio": "Богданова Анастасия Виталиевна"},
+    {"fio": "Лазарева Алина Эдуардовна"},
+    {"fio": "Карасевич Доминика Ипполитовна"},
+    {"fio": "Чендев Семен Эрнестович"},
+    {"fio": "Немов Серафим Семенович"},
+    {"fio": "Ялчевский Натан Давидович"},
+    {"fio": "Хохлов Фома Владимирович"},
+    {"fio": "Шувалов Семён Фомевич"},
+    {"fio": "Ольховский Андрон Глебович"},
+    {"fio": "Юферев Радион Владиславович"},
+    {"fio": "Капнист Авдей Никонович"},
+    {"fio": "Пахомов Захар Еремеевич"},
+    {"fio": "Гуляева Сабина Мироновна"}
+  ]
+}