func_code_string: #include <bits/stdc++.h>   using namespace std;   long long d, k, a, b, t;   void solve() {     cin >> d >> k >> a >> b >> t;     if (d <= k) {       cout << d * a;       return;     }     long long ans = k * a + d * b - k * b;     long long mult = t + k * a - k * b;     if (mult >= 0) {       cerr << 1 <<   n ;       cout << ans;     } else {       mult = abs(mult);       long long low = 0;       long long high = d / k - 1;       long long n = ans / mult;       long long ans2 =           min(d * b, d * a + (long long)ceil(((double)d) / k - 1) * t);       if (n >= low && n <= high) {         cout << min(ans2, ans - n * mult);       } else if (n > high) {         cout << min(ans2, ans - high * mult);       } else         cout << min(ans2, ans);     }   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     solve();     return 0;   }   