#include<bits/stdc++.h>
using namespace std;
int main() 
{
	long long a,b,c,d,e,f,g;
	cin>>a>>b>>c>>d>>e>>f>>g;
	long long cost1=(a/b+1)*c;
	long long cost2=(a/d+1)*e;
	long long cost3=(a/f+1)*g;
	if(cost1<cost2&&cost1<cost3) cout<<cost1;
	else if(cost2<cost1&&cost2<cost3) cout<<cost2;
	else if(cost3<cost1&&cost3<cost2) cout<<cost3;
	return 0;
}