#include<bits/stdc++.h>
using namespace std;
int main(){
	int n; cin>>n;
	int a,ai,b,bi,c,ci;
	cin>>a>>ai>>b>>bi>>c>>ci;
	int na,nb,nc;
	if(n%a==0) na=n/a*ai;
	else  na=(n/a+1)*ai;
	if(n%b==0) nb=n/b*bi;
	else  nb=(n/b+1)*bi;
	if(n%c==0) nc=n/c*ci;
	else  nc=(n/c+1)*ci;
	cout<<max(na,max(nb,nc));
	return 0;
}