Solution 003 added

Author: AmanMehta22

Problems/Mathematics/Day-02/sol/AmanMehta22/solution003.cpp

@@ -0,0 +1,20 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+	// your code goes here
+    int N;
+    cin>>N;
+    int result=0;
+    for(int i=1;i<=N;i++){
+        for(int j=1;j<=N;j++){
+            for(int k=1;k<=i;k++){
+                for(int l=1;l<=j;l++){
+                    int x=(__gcd(k,i))*(__gcd(l,j))*(__gcd(i,j));
+                    result+=x;
+                }
+            }
+        }
+    }
+    cout<<result<<endl;
+}