import sys
input=lambda: sys.stdin.readline().rstrip()
S=input()
X=""
Y=""
OP=[]
st=0
for i in range(len(S)):
  s=S[i]
  if s=="+" or s=="-":
    OP.append(s)
    if i!=0:
      st=1
  else:
    if st==0:
      X+=s
    else:
      Y+=s
x,y=int(X),int(Y)
if len(OP)==1:
  if OP[0]=="+":
    print(x-y)
  else:
    print(x+y)
elif len(OP)==2:
  if S[0]=="+":
    if OP[1]=="+":
      print(x-y)
    else:
      print(x+y)
  elif S[0]=="-":
    if OP[1]=="+":
      print(-x-y)
    else:
      print(-x+y)
  else:
    if OP[1]=="+":
      if OP[0]=="+":
        print(x-y)
      else:
        print(x+y)
    else:
      if OP[0]=="+":
        print(x+y)
      else:
        print(x-y)
else:
  if OP[0]=="-":
    x=-x
  if OP[2]=="-":
    y=-y
  if OP[1]=="+":
    print(x-y)
  else:
    print(x+y)