/*
 * 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 n = sc.nextLong
  val t = n / 15 * 16
  val rem = n % 15
  val app = 2 * (rem / 5 + rem / 3)
  println(t + app)
}