#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,min=200000;
	cin>>n;
	int a[4],b[4],c[4]={0};
	for(int i=1;i<=3;i++)
	{
	  cin>>a[i]>>b[i];
	  if(n%a[i]!=0)
	  c[i]=(n/a[i]+1)*b[i];
	  if(c[i]<min)
	  min=c[i];
	}
    cout<<min;
	return 0;
}