n=int(input())
a=list(map(int,input().split()))
ans=-10**20

for f1 in [0,1]:
  for f2 in [0,1]:
    ca=a+[0]
    for i in range(n):
      ca[i]+=ca[i-1]
    q=[0]*n
    l=0
    for i in range(n):
      q[i]=ca[i]-l
      l=min(l,ca[i]) if f1 else max(l,ca[i])
    ql=q[:]
    ca=a[::-1]+[0]
    for i in range(n):
      ca[i]+=ca[i-1]
    q=[0]*n
    l=0
    for i in range(n):
      q[i]=ca[i]-l
      l=min(l,ca[i]) if f2 else max(l,ca[i])
    qr=q[:]
    qr=qr[::-1]
    for f3 in [0,1]:
      for f4 in [0,1]:
        cl=ql[:]
        for i in range(1,n):
          cl[i]=min(cl[i],cl[i-1]) if f3 else max(cl[i],cl[i-1])
        cr=qr[:]
        for i in range(n-1):
          cr[i]=min(cr[i],cr[i+1]) if f4 else max(cr[i],cr[i+1])
        for i in range(n-1):
          ans=max(ans,cl[i]*cr[i+1])

print(ans)