#include<iostream>
using namespace std;
int main(){
    long long n,n1,n2,n3,p1,p2,p3,t1,t2,t3,total;
    cin>>n>>n1>>p1>>p2>>n2>>n3>>p3;
    t1=!(n%n1)?n/n1*p1:(n/n1+1)*p1;
    t2=!(n%n2)?n/n2*p2:(n/n2+1)*p2;
    t3=!(n%n3)?n/n3*p3:(n/n3+1)*p3;
    total=t1;
    if(t2<total)total=t2;
    if(t3<total)total=t3;
    cout<<total<<endl;
}