package main

import (
	"fmt"
)

func main () {
	// 入力
	var num int64

	fmt.Scan(&num)

	FizzBuzz := num / 15
	Fizz := num / 5 - FizzBuzz
	Buzz := num / 3 - FizzBuzz

	fmt.Println(FizzBuzz * 4 + Fizz * 2 + Buzz * 2)
}