import strutils, sequtils, algorithm, math

let
  s = readLine(stdin)
  ope = ['+', '-']

var
  pre: int
  preOpe: int
  tmpResult = 0
  maxResult = 0

for start in countup(0, s.len() - 1):
  if s[start] in ope or s[(start + s.len() - 1) mod s.len()] in ope:
    continue
  pre = s[start].ord - 48
  preOpe = -1
  for ite in countup(start + 1, start + s.len() - 1):
    if s[ite mod s.len()] in ope:
      if preOpe == 0:
        tmpResult += pre
      elif preOpe == 1:
        tmpResult -= pre
      else:
        tmpResult = pre
      pre = 0
      if s[ite mod s.len()] == '+':
        preOpe = 0
      else:
        preOpe = 1
    else:
      pre = pre * 10 + s[ite mod s.len()].ord - 48
  if preOpe == 0:
    tmpResult += pre
  else:
    tmpResult -= pre
  maxResult = max(tmpResult, maxResult)

echo maxResult