96分！help me!!!

#include<bits/stdc++.h>
using namespace std;
int main() {
	double a, a2, a3, b, b2, b3, c, c2, c3, n, ans;
	cin >> n >> a >> a2 >> b >> b2 >> c >> c2;
	a3 = ceil(n / a);
	a3 *= a2;
	b3 = ceil(n / b);
	b3 *= b2;
	c3 = ceil(n / c);
	c3 *= c2;
	ans = min(min(a3, b3), c3);
	cout << ans;
	return 0;
}