n = int(input())
A = list(map(int, input().split()))

A.sort()
if n == 1:
    print(A[0])
elif n == 2:
    print(A[0] * A[1])
elif n % 2 == 1:
    print(1)
else:
    if A[1] == 1:
        print(1)
    elif A[0] == 1:
        print(A[1])
    else:
        print(min(A[0] * A[1], A[2]))