func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(false);     cin.tie();     long long a, b, c, n, x;     cin >> a >> b >> c >> n;     x = a + b - c;     x = n - x;     if (x < 1 || c > a || c > b || c > (a + b))       cout << -1 << endl;     else       cout << x << endl;     return 0;   }   