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

def warizan(a, b):
    if a*b > 0:
        return abs(a)//abs(b)
    else:
        return -(abs(a)//abs(b))

m, M = A[0], A[0]
for i in range(1, N):
    a = A[i]
    candi = []
    for num in [m, M]:
        candi.append(num + a)
        candi.append(num - a)
        candi.append(num * a)
        if a != 0:
            candi.append(warizan(num, a))
    candi.sort()
    m, M = candi[0], candi[-1]

print(M)