n = int(input())
a = [int(x) for x in input().split()]

assert 2 <= n <= 2 * 10 ** 5
for x in a:
    assert - 10 ** 4 <= x <= 10 ** 4

from collections import defaultdict

inf = 10 ** 18

# 区間[0:l]の連続部分列としてあり得るmax
def calc(a):
    res = [-inf]*n
    mi = 0
    s = 0
    for i in range(n):
        s += a[i]
        res[i] = s - mi
        mi = min(mi, s)
    
    for i in range(n-1):
        res[i+1] = max(res[i+1], res[i])
    
    return res

def solve(a):
    l = calc(a)
    r = calc(a[::-1])[::-1]
    
    ans = -inf
    for i in range(n-1):
        tmp = l[i] * r[i+1]
        ans = max(ans, tmp)
    return ans

print(max(solve(a), solve([-i for i in a])))