# -*- coding: utf-8 -*-
"""
Created on Fri May  9 20:34:01 2025

@author: Tekyla
"""

#from sys import stdin
#input = lambda :stdin.readline()[:-1]

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

L = [A[0]]
for i in range(1, N):
    L.append(max(L[-1] + A[i], A[i]))
for i in range(1, N):
    L[i] = max(L[i-1], L[i])

R = [A[-1]]
for i in range(1, N):
    R.append(max(R[-1] + A[N-1-i], A[N-1-i]))
for i in range(1, N):
    R[i] = max(R[i-1], R[i])
R = R[::-1]
ans = -10**9
for i in range(N-1):
    ans = max(ans, L[i]*R[i+1])

# 負の場合
L = [A[0]]
for i in range(1, N):
    L.append(min(L[-1] + A[i], A[i]))
for i in range(1, N):
    L[i] = min(L[i-1], L[i])
    
R = [A[-1]]
for i in range(1, N):
    R.append(min(R[-1] + A[N-1-i], A[N-1-i]))
for i in range(1, N):
    R[i] = min(R[i-1], R[i])
R = R[::-1]
for i in range(N-1):
    ans = max(ans, L[i]*R[i+1])

print(ans)