/*
 * Reference: http://lizan.asia/blog/2012/12/11/scala-competitive/
 */

object Main extends App {
  import java.{util => ju}
  import scala.annotation._
  import scala.collection._
  import scala.collection.{mutable => mu}
  import scala.collection.JavaConverters._
  import scala.math._

  val sc = new ju.Scanner(System.in)
 val t = sc.nextLong
println(264+52*t)
}