import java.util.Scanner

object Problem222 {
  def main(args: Array[String]) {
    val sc = new Scanner(System.in)
    val expr = sc.next()

    val exprRegex = """^([\+\-]?[0-9]+)([\+\-])([\+\-]?[0-9]+)$""".r

    val exprRegex(x, op, y) = expr

    val result = op match {
      case "+" => x.toInt - y.toInt
      case "-" => x.toInt + y.toInt
    }

    println(result)
  }
}