import math._

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

    val re = """((?:-|\+)?\d+)(-|\+)((?:-|\+)?\d+)""".r
    val re(x, op, y) = s
    val ans = op match {
      case "+" => x.toInt - y.toInt
      case "-" => x.toInt + y.toInt
    }
    println(ans)
  }
}