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

def f(a):
    S = [0]
    for i in range(N):
        S.append(S[-1] + a[i])

    left = [(float("inf"),float("-inf"))]
    MIN,MAX = 0,0
    for i in range(1,N+1):
        min_v = min(left[-1][0],S[i] - MAX)
        max_v = max(left[-1][1],S[i] - MIN)
        left.append((min_v,max_v))
        MAX = max(MAX,S[i])
        MIN = min(MIN,S[i])
    return left

left = f(A)
right = f(A[::-1])
ans = float("-inf")
for i in range(1,N):
    ans = max(ans,left[i][0] * right[N-i][0],left[i][1] * right[N-i][1])
print(ans)