N = int(input())
lsA = list(map(int,input().split()))
# Bobで終わるときはans=1
# Aliceで終わるとき?
if N == 1:
    print(lsA[0])
    exit()
if N % 2 == 1:
    print(1)
    exit()

lsA.sort()
aa = lsA[0]*lsA[1]
lsA = [aa]+lsA[2:]
lsA.sort()
print(lsA[0])