#include<iostream>
using namespace std;
int main(){
    int a,b,c,d,e,f,g,h,i,j,k;
    cin>>a>>b>>c>>d>>e>>f>>g;
    h=(a%b==0)? a/b*c:(a/b+1)*c;
    i=(a%d==0)? a/d*e:(a/d+1)*e;
    j=(a%f==0)? a/f*g:(a/f+1)*g;
    k=h;
    if(i<k)
        k=i;
    if(j<k)
        k=j;
    cout<<k;
}