#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a, b, c, d, e, f, g;
	int t1, t2, t3;
	cin >> a >> b >> c >> d >> e >> f >> g;
	if(a % b == 0)
	{
		t1 = (a / b) * c;
	}
	else
	{
		t1 = (a / b + 1) * c;
	}
	if(a % d == 0)
	{
		t2 = (a / d) * e;
	}
	else
	{
		t2 = (a / d + 1) * e;
	}
	if(a % f == 0)
	{
		t3 = (a / f) * g;
	}
	else
	{
		t3 = (a / f + 1) * g;
	}
	int h[3] = {t1, t2, t3};
	sort(h, h+2);
	cout << h[2];
	return 0;
}