func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int num, sum = 0;     for (int i = 0; i < 5; ++i) {       cin >> num;       sum += num;     }     if (!(sum % 5) && sum > 0)       cout << sum / 5 << endl;     else       cout <<  -1  << endl;     return 0;   }   