AC

#include <bits/stdc++.h>
using namespace std;
int main(){
	int n, a1, a2, b1, b2, c1, c2;
	cin>>n>>a1>>a2>>b1>>b2>>c1>>c2;
	int m1, m2, m3;
	if(n%a1!=0){
		m1=n/a1+1;
		m1*=a2;
	}else{
		m1=(n/a1)*a2;
	}
	if(n%b1!=0) {
		m2=n/b1+1;
		m2*=b2 ;
	}else{
		m2=(n/b1)*b2;
	}
	if(n % c1 != 0) {
		m3=n/c1+1;
		m3*=c2 ;
	}else{
		m3=(n/c1)*c2;
	}
	
	if(m2>m1&&m3>m1){
		cout<<m1;
	}else if(m1> m2 && m3 > m2){
		cout<<m2;
	}else{
		cout<<m3;
	}
	return 0;
}