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 ans = 0;     if (a < c) ans = ceil((double(a - c) * w + b) / (x - w));     cout << ans;     return 0;   }   