// luogu-judger-enable-o2
#include<bits/stdc++.h>
using namespace std;
int main()
{
int a1,a2,b1,b2,c1,c2,n,x,y,z;
cin>>n>>a1>>a2>>b1>>b2>>c1>>c2;
x=n/a1;
y=n/b1;
z=n/c1;
if(n%a1)x++;
if(n%b1)y++;
if(n%c1)z++;
x=x*a2;
y=y*b2;
z=z*c2;
if(x<y&&x<z)cout<<x<<endl;
else if(y<x&&y<z)cout<<y<<endl;
else cout<<z<<endl;
return 0;
}
by 张英豪 @ 2019-07-25 11:14:41