import math._

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

    val xs = Array(0, 0, 0, 2, 0, 2, 2, 0, 0, 2, 2, 0, 2, 0, 0, 4)

    val a = n / 15
    var ans = (n / 15) * xs.sum
    for (i <- 1 to (n % 15).toInt) {
      ans += xs(i)
    }
    println(ans)
  }
}