def expr(s):
  global i
  res=term(s)
  while i<len(s):
    if s[i]=='+':
      i+=1
      res+=term(s)
    elif s[i]=='-':
      i+=1
      res-=term(s)
    else:
      break
  return res

def term(s):
  return factor(s)

def factor(s):
  global i
  if s[i]=='(':
    i+=1
    res=expr(s)
    if s[i]==')':
      i+=1
    return res
  return number(s)

def number(s):
  global i
  res=''
  while i<len(s) and '0'<=s[i]<='9':
    res+=s[i]
    i+=1
  return int(res)

s=input()
i=0
print(expr(s))