N = int(input())
A = list(map(int, input().split()))
ma, mi = A[0], A[0]
A.pop(0)

def f(x, y):
    if x < 0:
        x, y = -x, -y
    if y > 0:
        return x//abs(y)
    else:
        return -(x//abs(y))

for a in A:
    if a != 0:
        ma2 = max(ma + a, ma * a, ma - a, f(ma, a), mi + a, mi * a, mi - a, f(mi, a))
        mi2 = min(ma + a, ma * a, ma - a, f(ma, a), mi + a, mi * a, mi - a, f(mi, a))
    else:
        ma2 = max(ma + a, ma * a, ma - a, mi + a, mi * a, mi - a)
        mi2 = min(ma + a, ma * a, ma - a, mi + a, mi * a, mi - a)
    ma, mi = ma2, mi2
print(ma)