S=input()
def solve(s):
  ans=0
  pre=0
  curr=0
  op='*'
  for i,c in enumerate(s):
    if c.isdigit():
      curr=curr*10+int(c)
    if not c.isdigit() and c!=' ' or i==len(s)-1:
      if op=='+':
        if ans==0: ans=curr
        else:ans*=curr
      elif op=='*':
        ans=ans+curr
      op=c
      curr=0
  return ans
print(solve(S))