#!/usr/bin/env python
# -*- coding: utf-8 -*-

def main():
    n = int(input())
    
    fizzbuzz = int(n / 15)
    fizz = int(n / 3) - fizzbuzz
    buzz = int(n / 5) - fizzbuzz
    
    result = fizzbuzz * 4 + fizz * 2 + buzz * 2
    print(result)

if __name__ == '__main__':
    main()