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:
    try:
      ans=max(ans,eval(S[i:i+n]))
    except:
      pass
print(ans)