func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int a, b, c, n;     cin >> a >> b >> c >> n;     int tot = n - a - b + c;     if (tot <= 0 || a < c || b < c) return 0 * puts( -1 );     cout << tot << endl;     return 0;   }   