func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long a, b, w, x, c;     cin >> a >> b >> w >> x >> c;     long long delta = c - a;     if (delta <= 0) {       cout << 0 << endl;     } else {       double k = (1.0 * delta * x - b) / (w - x);       long long t = ceil(delta + k);       cout << t << endl;     }     return 0;   }   