#include<iostream> 
#include<cmath>
#include<cstdio>
#include<algorithm>
using  namespace  std;

int main()
{  int n,a,b,c,d,e,f;
  cin>>n>>a>>b>>c>>d>>e>>f;
  if(n%a>0)
  a=n/a+1;
  if(n%a==0)
  a=n/a;
  if(n%c>0)
  c=n/c+1;
  if(n%c==0)
  c=n/c;
  if(n%e>0)
  e=n/e+1;
  if(n%e==0)
  e=n/e;
  
 if(a*b<c*d&&a*b<e*f)
  cout<<a*b<<endl;
 if(c*d<a*b&&c*d<e*f)
  cout<<c*d<<endl;
 if(e*f<a*b&&e*f<c*d)
  cout<<e*f<<endl;
	return 0;
}