diff --git a/logs/app.log b/logs/app.log
new file mode 100644
index 00000000..2d4c17be
--- /dev/null
+++ b/logs/app.log
@@ -0,0 +1,40 @@
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 1, counter value 20
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 1, counter value 19
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 20, counter value 19
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 20, counter value 18
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 19, counter value 18
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 19, counter value 17
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 18, counter value 17
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 18, counter value 16
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 17, counter value 16
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 17, counter value 15
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 16, counter value 15
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 16, counter value 14
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 15, counter value 14
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 15, counter value 13
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 14, counter value 13
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 14, counter value 12
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 13, counter value 12
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 13, counter value 11
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 12, counter value 11
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 12, counter value 10
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 11, counter value 10
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 11, counter value 9
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 10, counter value 9
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 10, counter value 8
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 9, counter value 8
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 9, counter value 7
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 8, counter value 7
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 8, counter value 6
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 7, counter value 6
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 7, counter value 5
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 6, counter value 5
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 6, counter value 4
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 5, counter value 4
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 5, counter value 3
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 4, counter value 3
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 4, counter value 2
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 3, counter value 2
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 3, counter value 1
+INFO core.basesyntax.Counter:12 Before decrementing, Thread # 2, counter value 1
+INFO core.basesyntax.Counter:17 After decrementing, Thread # 2, counter value 0
diff --git a/src/main/java/core/basesyntax/Counter.java b/src/main/java/core/basesyntax/Counter.java
index 4af46bd4..cb9a0e33 100644
--- a/src/main/java/core/basesyntax/Counter.java
+++ b/src/main/java/core/basesyntax/Counter.java
@@ -5,18 +5,16 @@
 
 public class Counter {
     private static final Logger logger = LogManager.getLogger(Counter.class);
-    private static final String MESSAGE = "%20s, Thread # %2s, counter value %2d";
-    private int value;
 
-    public Counter(int value) {
-        this.value = value;
-    }
+    private int value = 20;
+
+    public synchronized void decrement() {
+        logger.info("Before decrementing, Thread # {}, counter value {}",
+                Thread.currentThread().getName(), value);
 
-    public void decreaseValue() {
-        logger.info(String.format(MESSAGE,
-                "Before decrementing", Thread.currentThread().getName(), value));
         value--;
-        logger.info(String.format(MESSAGE,
-                "After decrementing", Thread.currentThread().getName(), value));
+
+        logger.info("After decrementing, Thread # {}, counter value {}",
+                Thread.currentThread().getName(), value);
     }
 }
diff --git a/src/main/java/core/basesyntax/Main.java b/src/main/java/core/basesyntax/Main.java
index 48a2c730..04055eef 100644
--- a/src/main/java/core/basesyntax/Main.java
+++ b/src/main/java/core/basesyntax/Main.java
@@ -1,10 +1,18 @@
 package core.basesyntax;
 
 public class Main {
-    public static void main(String[] args) {
-        Counter counter = new Counter(20);
-        for (int i = 1; i <= 20; i++) {
-            new MyThread(counter, String.valueOf(i)).start();
+    public static void main(String[] args) throws InterruptedException {
+        Counter counter = new Counter();
+
+        Thread[] threads = new Thread[20];
+
+        for (int i = 0; i < 20; i++) {
+            threads[i] = new MyThread(counter, String.valueOf(i + 1));
+            threads[i].start();
+        }
+
+        for (Thread thread : threads) {
+            thread.join();
         }
     }
 }
diff --git a/src/main/java/core/basesyntax/MyThread.java b/src/main/java/core/basesyntax/MyThread.java
index e20649e6..767e39ec 100644
--- a/src/main/java/core/basesyntax/MyThread.java
+++ b/src/main/java/core/basesyntax/MyThread.java
@@ -10,6 +10,6 @@ public MyThread(Counter counter, String name) {
 
     @Override
     public void run() {
-        counter.decreaseValue();
+        counter.decrement();
     }
 }