[C++] 백준 10707번 : 수도요금

https://www.acmicpc.net/problem/10707

#include <iostream>

using namespace std;

int main() {

int a, b, c, d, p;

cin >> a >> b >> c >> d >> p;

int x, y;

x = a * p;

if (p > c)

y = (p - c)*d + b;

else

y = b;

if (x < y) 

cout << x;

else 

cout << y;

}