#include<bits/stdc++.h>
using namespace std;
struct qianbi
{
	int zhishu;
	int jiage;	
};

int main()
{
	int n;
	cin >> n;
	vector<int>c(3,0);
	for(int i = 0;i < 3;i++)
	{
		qianbi a;
		cin >> a.zhishu >> a.jiage;
		if(n%a.zhishu==0)
		{
			c[i]=n/a.zhishu*a.jiage;
		}
		else
		{
			c[i]=(n/a.zhishu+1)*a.jiage;
		}
	}
	sort(c.begin(),c.end());
	cout<<c[0];
	return 0;
 }