#include <bits/stdc++.h>

using namespace std;
// https://img-blog.csdnimg.cn/2019071311082673.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjYxOTE5,size_16,color_FFFFFF,t_70
int main() {
    int n;
    scanf("%d", &n);

    int a, b, c, d, e, f, g, h, i;
    scanf("%d %d %d %d %d %d", &a, &b, &d, &e, &g, &h);

    //第一组
    c = ((n - 1) / a + 1) * b;
    //第二组
    f = ((n - 1) / d + 1) * e;
    //第三组
    i = ((n - 1) / g + 1) * h;

    //取最小值时的办法
    printf("%d\n", min({c, f, i}));

    return 0;
}