#include <cstdio>
#include <cmath>
int main() {
int n, i, x, y, sum = 130, a, b;
scanf("%d", &n);
for (i = 1; i <= 3; i++) {
scanf("%d%d", &x, &y);
if (x != 0) {
a = int(1.0 * n / x + 0.9999999);
b = a * y;
if (b < sum) sum = b;
}
}
printf("%d", sum);
return 0;
} ( )
7788(2)
