N=int(input())
A=list(map(int,input().split()))
if N==2:
  print(A[0]*A[1])
  exit()
result=0
v1=[0]*N
v2=[0]*(N+1)
x=0
c=0
for i in range(N):
  c+=A[i]
  v1[i]=max(v1[i-1],c-x)
  x=min(x,c)
x=0
c=0
for i in range(N-1,-1,-1):
  c+=A[i]
  v2[i]=max(v2[i+1],c-x)
  x=min(x,c)
for i in range(N-1):
  result=max(result,v1[i]*v2[i+1])
for i in range(N):
  A[i]=-A[i]
v1=[0]*N
v2=[0]*(N+1)
x=0
c=0
for i in range(N):
  c+=A[i]
  v1[i]=max(v1[i-1],c-x)
  x=min(x,c)
x=0
c=0
for i in range(N-1,-1,-1):
  c+=A[i]
  v2[i]=max(v2[i+1],c-x)
  x=min(x,c)
for i in range(N-1):
  result=max(result,v1[i]*v2[i+1])
print(result)