func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, a[5], sum = 0;     for (int i = 0; i < 5; i++) {       cin >> a[i];       sum += a[i];     }     n = sum / 5;     if (sum == 0)       cout << -1;     else if (n * 5 == sum)       cout << n;     else       cout << -1;     return 0;   }   