문제
풀이
#include <iostream>
using namespace std;
int ceil(int a, int b) {
return (a+b-1) / b;
}
int solve(void) {
int w, h; cin >> w >> h;
int n, a, b; cin >> n >> a >> b;
return (a > w || b > h) ? -1 : ceil(n, (w/a)*(h/b));
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout << solve();
return 0;
}