#include<iostream>
using namespace std;
int a,b,c,d,e,f,g,m,n,q,p;
int main()
{
	cin>>a;
	cin>>b>>c>>d>>e>>f>>g;
	if(a%b==0) m=a/b*c; else m=(a/b+1)*c;
	if(a%e==0) n=a/d*e; else n=(a/d+1)*e;
	if(a%f==0) q=a/f*g; else q=(a/f+1)*g;
	if(m<n) 
	{
	    if(q<m) p=q; 
	    else p=m;
	}
	else 
	{
	    if(q<n) p=q; 
	    else p=n;
	}
	cout<<p<<endl;
	return 0;
}