import algorithm, sequtils, strutils

let
  s = stdin.readLine
var
  xs = s.multiReplace({"*":" * ", "+":" + "}).split
  result = 0

xs.applyIt(if it.len > 5: "0" else: it)

result = xs[0].parseInt
xs = xs[1..^1]
reverse xs

while xs.len > 0:
  let
    ope = xs.pop
    val = xs.pop
  if ope == "*":
    result = result + val.parseInt
  else:
    result = result * val.parseInt

echo result