s=input()

def number():
  global i
  tmp=0
  while i<len(s) and '0'<=s[i]<='9':
    tmp=10*tmp+int(s[i])
    i+=1
  return tmp

i=0
res=number()
while i!=len(s):
  c=s[i]
  i+=1
  res2=number()
  if c=='+':
    res*=res2
  else:
    res+=res2

print(res)