from re import X


n = int(input())
a = list(map(int,input().split()))
a.sort(reverse = True)
ans = a[0]
for i in range(1, n):
    if i % 2 == 1:
        ans *= a[i]
    else:
        ans = (a[n - i - 1] + ans - 1) // ans
print(ans)