diff --git a/.gitignore b/.gitignore
index 83f79cb..931a5eb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,5 +17,6 @@
 *.class
 *.pyc
 *.html
+.idea/
 
 
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..79b3c94
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CMakeWorkspace" PROJECT_DIR="$PROJECT_DIR$" />
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/2017/JULY.md b/2017/JULY.md
index 9a4c22d..c9f4e1d 100644
--- a/2017/JULY.md
+++ b/2017/JULY.md
@@ -13,7 +13,7 @@
 | [JULY17](https://www.codechef.com/JULY17) | [CHEFSIGN](https://www.codechef.com/JULY17/problems/CHEFSIGN) | ★★ | | [![image](../img/GH.png)](JULY/JULY17/CHEFSIGN/CHEFSIGN.cpp)  [![image](../img/CC.png)](https://www.codechef.com/viewsolution/14502863) (100 pts) [![image](../img/AC.png)](#) | |  [![image](../img/GH.png)](JULY/JULY17/CHEFSIGN/CHEFSIGN.py)  [![image](../img/CC.png)](https://www.codechef.com/viewsolution/14488195) (100 pts) [![image](../img/AC.png)](#) |
 | [JULY17](https://www.codechef.com/JULY17) | [CALC](https://www.codechef.com/JULY17/problems/CALC) | ★★★ | [![image](../img/GH.png)](JULY/JULY17/CALC/CALC.c)  [![image](../img/CC.png)](https://www.codechef.com/viewsolution/14483078) (100 pts) [![image](../img/AC.png)](#) | [![image](../img/GH.png)](JULY/JULY17/CALC/CALC.cpp)  [![image](../img/CC.png)](https://www.codechef.com/viewsolution/14439041) (100 pts) [![image](../img/AC.png)](#) | | [![image](../img/GH.png)](JULY/JULY17/CALC/CALC.py)  [![image](../img/CC.png)](https://www.codechef.com/viewsolution/14490655) (100 pts) [![image](../img/AC.png)](#) |
 | [JULY17](https://www.codechef.com/JULY17) | [IPCTRAIN](https://www.codechef.com/JULY17/problems/IPCTRAIN) | ★★★ | | [![image](../img/GH.png)](JULY/JULY17/IPCTRAIN/IPCTRAIN.cpp)  [![image](../img/CC.png)](https://www.codechef.com/viewsolution/14431781) (100 pts) [![image](../img/AC.png)](#) | | |
-| [JULY17](https://www.codechef.com/JULY17) | [EXPTREE](https://www.codechef.com/JULY17/problems/EXPTREE) | ★★★★ | | | | [![image](../img/GH.png)](JULY/JULY17/EXPTREE/EXPTREE.py)  [![image](../img/CC.png)](https://www.codechef.com/viewsolution/14541593) (100 pts) [![image](../img/AC.png)](#) |
+| [JULY17](https://www.codechef.com/JULY17) | [EXPTREE](https://www.codechef.com/JULY17/problems/EXPTREE) | ★★★★ | | [![image](../img/GH.png)](JULY/JULY17/EXPTREE/EXPTREE.cpp)  [![image](../img/CC.png)](https://www.codechef.com/viewsolution/14568032) (100 pts) [![image](../img/AC.png)](#) | | [![image](../img/GH.png)](JULY/JULY17/EXPTREE/EXPTREE.py)  [![image](../img/CC.png)](https://www.codechef.com/viewsolution/14541593) (100 pts) [![image](../img/AC.png)](#) |
 | [JULY17](https://www.codechef.com/JULY17) | [PSHTTR](https://www.codechef.com/JULY17/problems/PSHTTR) | ★★★★ | | | | |
 | [JULY17](https://www.codechef.com/JULY17) | [TWOCOINS](https://www.codechef.com/JULY17/problems/TWOCOINS) | ★★★★ | | | | |
 | [JULY17](https://www.codechef.com/JULY17) | [SRVRS](https://www.codechef.com/JULY17/problems/SRVRS) | ★★★★★ | | | | |
diff --git a/2017/JULY/JULY17/CHEFSIGN/CHEFSIGN.cpp b/2017/JULY/JULY17/CHEFSIGN/CHEFSIGN.cpp
index 7b572d3..f9a9a0d 100644
--- a/2017/JULY/JULY17/CHEFSIGN/CHEFSIGN.cpp
+++ b/2017/JULY/JULY17/CHEFSIGN/CHEFSIGN.cpp
@@ -5,7 +5,6 @@
 using namespace std;
 
 int main() {
-
 	 std::ios::sync_with_stdio(false);
 	 int testCases;
 	 cin >> testCases;
diff --git a/2017/JULY/JULY17/EXPTREE/EXPTREE.cpp b/2017/JULY/JULY17/EXPTREE/EXPTREE.cpp
new file mode 100644
index 0000000..eaef220
--- /dev/null
+++ b/2017/JULY/JULY17/EXPTREE/EXPTREE.cpp
@@ -0,0 +1,58 @@
+// BY: _nishant0208_
+#include <bits/stdc++.h>
+#include <algorithm>
+using namespace std;
+typedef long long ll;
+#define MAX1  1000000007
+#define MAX2  1000000009
+#define MAX 100001
+ll MOD;
+ll exponent(ll, ll);
+ll modinverse(ll);
+int main(){
+    ll t;
+    cin >> t;
+    while(t--){
+        ll n;
+        cin >> n;
+        n--;
+        ll x, y, temp1, temp2;
+        MOD = MAX1;
+        x = ((n % MOD) * ((n + 1) % MOD)) % MOD;
+        y = (2 * ((2 * n - 1) % MOD)) % MOD;
+        if(x % 2 == 0 && y % 2 == 0){
+            x /= 2;
+            y /= 2;
+        }
+        if(x % 3 == 0 && y % 3 == 0){
+            x /= 3;
+            y /= 3;
+        }
+        temp1 = ((x % MOD) * (modinverse(y))) % MOD;
+        MOD = MAX2;
+        x = ((n % MOD) * ((n + 1) % MOD)) % MOD;
+        y = (2 * ((2 * n - 1) % MOD)) % MOD;
+        if(x % 2 == 0 && y % 2 == 0){
+            x /= 2;
+            y /= 2;
+        }
+        if(x % 3 == 0 && y % 3 == 0){
+            x /= 3;
+            y /= 3;
+        }
+        temp2 = ((x % MOD) * (modinverse(y))) % MOD;
+        cout << temp1 << " " << temp2 << "\n";
+    }
+    return 0;
+}
+ll exponent(ll a, ll b) {
+    if(b == 0)
+        return 1;
+    ll temp = (exponent(a, b / 2)) % MOD;
+    temp = (temp * temp) % MOD;
+    return (b % 2 == 0) ? temp : ((a % MOD) * temp) % MOD;
+}
+ll modinverse(ll val) {
+    return exponent(val, MOD - 2);
+}
+