N = int(input())
p = []
maxi = 0

for i in range(N):
    p.append(int(input()))

summi = sum(p)
for i in range(N):
  fsummi = sum(p[i:len(p)-i-1])
  if fsummi > maxi and fsummi>summi :
      maxi = fsummi

maxi2 = 0
for i in range(0, N-1):
  nsummi = sum(p[i::])
  jsummi=summi-nsummi
  if nsummi > jsummi:
    maxi2 = nsummi
  else:
    maxi2 = jsummi

if maxi>maxi2:
  print(maxi)
elif summi> maxi and summi>maxi2:
  print(summi)
else:
  print(maxi2)