N = int(input())
As = list(map(int, input().split()))
low = high = As[0]
for a in As[1:]:
    vals = [high * a, high + a, high - a, low * a, low + a, low - a]
    if a != 0:
        if high < 0:
            vals.append(-(-high//a))
        else:
            vals.append(high//a)
        if low < 0:
            vals.append(-(-low//a))
        else:
            vals.append(low//a)
    high = max(vals)
    low = min(vals)
print(high)