fun main(args: Array<String>){
  
  val (a,op,b) = readLine()!!.split(" ")
  var ans = 0
  
  when(op){
    "+" -> { ans = a.toInt() + b.toInt() }
    "-" -> { ans = a.toInt() - b.toInt() }
  }
  
  println(ans)
      
}
  