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

lmax = [0] * N
lmin = [0] * N
lmax[0] = lmin[0] = A[0]
for i in range(1, N-1):
    lmax[i] = max(A[i], A[i]+lmax[i-1])
    lmin[i] = min(A[i], A[i]+lmin[i-1])

for i in range(1, N-1):
    lmax[i] = max(lmax[i], lmax[i-1])
    lmin[i] = min(lmin[i], lmin[i-1])

rmax = [0] * N
rmin = [0] * N
rmax[N-1] = rmin[N-1] = A[N-1]
for i in range(N-2, 0, -1):
    rmax[i] = max(A[i], A[i]+rmax[i+1])
    rmin[i] = min(A[i], A[i]+rmin[i+1])

for i in range(N-2, 0, -1):
    rmax[i] = max(rmax[i], rmax[i+1])
    rmin[i] = min(rmin[i], rmin[i+1])

ans = max(lmax[0]*rmax[1], lmin[0]*rmin[1])
for i in range(1, N-1):
    ans = max(ans, lmax[i]*rmax[i+1], lmin[i]*rmin[i+1])
print(ans)