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:
    now = a[0] * a[1]
    del a[0]
    del a[0]
    a.append(now)
    a.sort()
    print(a[0])