N = int(input())
A = list(map(int, input().split()))
A.sort()
if N==2:
    ans = A[0]*A[1]
elif N%2==1:
    ans = A[0]
    for i in range(1,N):
        if i%2==1:
            ans *= A[i]
        else:
            ans = -(-ans//A[i])
else:
    ans = A[0]
    for i in range(1,N-2):
        if i%2==1:
            ans *= A[i]
        else:
            ans = -(-ans//A[i])
    ans = ans * -(-A[-2]//A[-1])
print(ans)