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#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;
}