import math._

object Main {
  def calc(s: String): Int = {
    val reg = "\\d+|[+*]".r
    val tokens = reg.findAllIn(s).toList

    var ans = tokens(0).toInt
    for (i <- 1 to tokens.length-1 by 2) {
      val rhs = tokens(i+1).toInt
      tokens(i) match {
        case "+" => ans *= rhs
        case "*" => ans += rhs
        case _ => assert(false)
      }
    }
    ans
  }

  def main(args: Array[String]) {
    val sc = new java.util.Scanner(System.in)
    val s = sc.next

    println(calc(s))
  }
}