import strutils

let
  S = stdin.readLine
var
  a: int
  b: string
  pre: char
  flg: bool

proc calc(s: char) =
  if flg:
    if pre == '*':
      a += b.parseInt
    else:
      a *= b.parseInt
  else:
    a = b.parseInt
  pre = s
  flg = true
  b = ""

for s in S & ' ':
  if s.isDigit:
    b.safeAdd s
  else:
    s.calc

echo a