#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
using namespace std;
int main() {
int sum = 0,a,b,n,t=100000,e=0;
cin >> n;
for (int i = 0; i < 3; i++) {
cin >> a >> b;
n % a == 0 ? sum = ((n / a) * b) : sum=(((n / a) + 1) * b);
if (t > sum) {
e = sum;
}
t = sum;
}
cout << e;
return 0;
}
