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

def FizzBuzzString(N):
    z = 0
    for i in range(1,N+1):
        if i % 15 == 0:
            z += 4
        elif i % 3 == 0:
            z += 2
        elif i % 5 == 0:
            z += 2
    print(z)
FizzBuzzString(int(input()))