func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int n, d, t, result, stored = 0;     cin >> n >> d;     for (int i = 0; i < n; i++) {       cin >> t;       stored += t;     }     d -= (n - 1) * 10;     if (d - stored >= 0) {       cout << (n - 1) * 2 + (d - stored) / 5;     } else       cout << -1;     return 0;   }   