func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int a, b, c, n;     while (~scanf( %d%d%d%d , &a, &b, &c, &n)) {       if (c > a || c > b || n - (a + b - c) < 1)         printf( -1 n );       else         printf( %d n , n - (a + b - c));     }     return 0;   }   