#include<bits/stdc++.h>

using namespace std;
long long n,a[10][10],e=2000000;
int main(){
	/*freopen("pencil.in","r",stdin);
	freopen("pencil.out","w",stdout);*/
	cin>>n;
	for(int i=1;i<=3;i++){
		cin>>a[1][i]>>a[2][i];
		if(n%a[1][i]>0){
			a[3][i]=(n/a[1][i]+1)*a[2][i];
		}
		else{
			a[3][i]=(n/a[1][i])*a[2][i];
		}
		if(e>a[3][i]){
			e=a[3][i];
		}
	}
	cout<<e<<" ";
	return 0;
}