func_code_string: #include <bits/stdc++.h>   int f[10005], c, d, n, m, k;   inline int min(int x, int y) { return x < y ? x : y; }   int main() {     scanf( %d %d %d %d %d , &c, &d, &n, &m, &k);     if (n * m <= k) {       puts( 0 );       return 0;     }     memset(f, 0x3f, sizeof(f));     f[0] = 0;     for (int i = 1; i <= n * m; ++i) {       if (i >= n) f[i] = f[i - n] + c;       f[i] = min(f[i], f[i - 1] + d);     }     int ans = 0x3f3f3f3f;     for (int i = n * m - k; i <= n * m; ++i)       if (f[i] < ans) ans = f[i];     printf( %d n , ans);     return 0;   }   