diff --git a/Codechef/SEPTLUNCH2020/SEPTLUNCH2.cpp b/Codechef/SEPTLUNCH2020/SEPTLUNCH2.cpp
new file mode 100644
index 0000000..5d20304
--- /dev/null
+++ b/Codechef/SEPTLUNCH2020/SEPTLUNCH2.cpp
@@ -0,0 +1,35 @@
+// september 2020 lunchtime PROBLEM-GCDOPS
+#include<bits/stdc++.h>
+using namespace std;
+#define ll long long int
+int main() {
+
+int t;
+cin>>t;
+while(t--)
+{
+    int n;
+    cin>>n;
+    int b[n];
+    for(int i=0;i<n;i++)
+    {
+        cin>>b[i];
+    }
+    bool flag=true;
+    for(int i=0;i<n;i++)
+    {
+        if((i+1)%b[i]==0)
+            continue;
+        else{
+            flag=false;
+            break;
+        }
+    }
+    if(flag==true)
+        cout<<"YES"<<endl;
+    else
+        cout<<"NO"<<endl;
+
+}
+return 0;
+}