import java.io.PrintWriter

fun main(args: Array<String>) {
  val pw = PrintWriter(System.out)

  val n = readLine()?.toInt() ?: 0

  val result =
      (1..n)
          .toList()
          .fold(
              0,
              { acc, a ->
                when {
                  a % 3 == 0 && a % 5 == 0 -> {
                    acc + 4
                  }
                  a % 3 == 0 -> {
                    acc + 2
                  }
                  a % 5 == 0 -> {
                    acc + 2
                  }
                  else -> {
                    acc
                  }
                }
              }
          )

  pw.println(result)

  pw.flush()
}