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

if n == 1:
    print(a[0])
elif n == 2:
    print(a[0] * a[1])
else:
    if n % 2 == 1:
        print(1)
    else:
        product = 1
        for num in a:
            product *= num
        print(product)