from sys import stdin
n, *a = map(int, stdin.read().split())

if n == 1:
    print("{}".format(a[0]))
    exit()
elif n == 2:
    print("{}".format(a[0]*a[1]))
    exit()
elif n % 2 == 1:
    print("{}".format(1))
    exit()

a.sort()
ans = min(a[0]*a[1],a[2])
print("{}".format(ans))