#include<iostream>
#include<algorithm>
#include<cmath>
using namespace std;
int main()
{
	int i=3,n,x,y,t,min=10000,sum;
	cin>>n;
	while(i--)
	{
		cin>>x>>y;
		t=(n/x)+1;
		sum=t*y;
		if(sum<min)
			min=sum;
	}
	cout<<min;
	return 0;
}