n = int(input())
alist = list(map(int, input().split()))

if n == 2:
	print(alist[0] * alist[1])
	exit()

lmax = [-(1 << 60) for i in range(n)]
rmax = [-(1 << 60) for i in range(n)]

lmax[0] = alist[0]
for i in range(1, n):
	lmax[i] = max(alist[i], lmax[i-1] + alist[i])
for i in range(1, n):
	lmax[i] = max(lmax[i], lmax[i-1])

rmax[-1] = alist[-1]
for i in range(n-1)[::-1]:
	rmax[i] = max(alist[i], rmax[i+1] + alist[i])
for i in range(n-1)[::-1]:
	rmax[i] = max(rmax[i], rmax[i+1])

ans = -(1 << 60)

for i in range(n-1):
	ans = max(ans, lmax[i] * rmax[i+1])

alist = [-a for a in alist]


lmax = [-(1 << 60) for i in range(n)]
rmax = [-(1 << 60) for i in range(n)]

lmax[0] = alist[0]
for i in range(1, n):
	lmax[i] = max(alist[i], lmax[i-1] + alist[i])
for i in range(1, n):
	lmax[i] = max(lmax[i], lmax[i-1])

rmax[-1] = alist[-1]
for i in range(n-1)[::-1]:
	rmax[i] = max(alist[i], rmax[i+1] + alist[i])
for i in range(n-1)[::-1]:
	rmax[i] = max(rmax[i], rmax[i+1])

for i in range(n-1):
	ans = max(ans, lmax[i] * rmax[i+1])
	
print(ans)