func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int a, b, c, d, e;     cin >> a >> b >> c >> d >> e;     if (a == 0 && b == 0 && c == 0 && d == 0 && e == 0)       cout << -1;     else if ((a + b + c + d + e) % 5 != 0)       cout << -1;     else       cout << (a + b + c + d + e) / 5;     return 0;   }   