#include<iostream>
#include<cmath>
#include<algorithm>
using namespace std;
int a, A, b, B, c, C;
int main()
{
	int r, s1, s2, s3, s;
	cin >> r;
	cin >> a >> A;
	cin >> b >> B;
	cin >> c >> C;
	s1 = (ceil(r / a)) * A;
	s2 = (ceil(r / b)) * B;
	s3 = (ceil(r / c)) * C;
	int i[3] = { s1,s2,s3 };
	sort(i, i + 3);
	s = i[0];
	cout << s << endl;
	return 0;
}