#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	int k,a1;
	int h,b1;
	int j,c1;
	cin>>n>>k>>a1>>h>>b1>>j>>c1;
	int a=ceil(n/k)*a1;
	int b=ceil(n/h)*b1;
	int c=ceil(n/j)*c1;
	if(a<=b){
		if(a<=c)cout<<a;
		else cout<<c;
	}else{
		if(b<=c)cout<<b;
		else cout<<c;
	}
	return 0;
}
(样例都过了)