#include<iostream>
#include<cstdio>
using namespace std;
int n,n1,p1,n2,p2,n3,p3,t1,t2,t3,boss;
int main(){
   scanf("%d%d%d%d%d%d%d",&n,&n1,&p1,&n2,&p2,&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;
   boss=t1;
   if(t2<t1)boss=t2;
   if(t3<t1)boss=t3;
   printf("%d",boss);
   return 0;
}   ```