#include<bits/stdc++.h>

using namespace std;

int main(){
    int n,n1,n2,n3,p1,p2,p3,t1,t2,t3,programme;
    cin>>n>>n1>>p1>>n2>>p2>>n3>>p3;
    t1 = !(n%n1) ?n /n1 *p1 : (n/n1+1)*p1;
    t2 = !(n%t2) ?n /n2 *p2 : (n/n2+1)*p2; 
    t3 = !(n%t3) ?n /n3 *p3 : (n/n3+1)*p3;
    programme = t1;
    if(t2<programme) programme = t2;
    if(t3<programme) programme = t3;
    cout<<programme<<endl;
    return 0;
}