[백준 10707번] 수도요금

소스코드

---

#include <iostream>
using namespace std;
 
int main() {
    int a, b, c, d, p;
    cin >> a >> b >> c >> d >> p;
    b = (p <= c ? b : b + ((p-c)*d));
    cout << (a*p < b ? a*p : b);
    return 0;
}