import sys
input=lambda: sys.stdin.readline().rstrip()
S=input()
ans=-float("inf")
n=len(S)
S=S+S
for i in range(n):
  if S[i]=="+" or S[i]=="-":
    continue
  elif S[i+n-1]=="+" or S[i+n-1]=="-":
    continue
  else:
    T=S[i:i+n]
    cur=0
    op="+"
    num=""
    for t in T:
      if t=="+" or t=="-":
        if op=="+":
          cur+=int(num)
        else:
          cur-=int(num)
        num=""
        op=t
      else:
        num+=t
    if op=="+":
      cur+=int(num)
    else:
      cur-=int(num)
    ans=max(ans,cur)
print(ans)