#include<bits/stdc++.h>
using namespace std;

int main()
{
	float n,a,a1,a2,a3,b,b1,b2,b3,c,c1,c2,c3;
	cin>>n>>a>>a1>>b>>b1>>c>>c1;
	a2=ceil(n/a);
	b2=ceil(n/b);
	c2=ceil(n/c);
	a3=a2*a1;
	b3=b2*b1;
	c3=c2*c1;
	if(a3<=b3 and a3<=c3)
	{
		if(a3==0) cout<<0<<endl;
		cout<<a3<<endl;
	}
	else if(b3<=a3 and b3<=c3)
	{
		if(b3==0) cout<<0<<endl;
		cout<<b3<<endl;
	}
	else if(c3<=a3 and c3<=b3)
	{
		if(c3==0) cout<<0<<endl;
		cout<<c3<<endl;
    }
	return 0;
}

不知错哪