# -*- coding: utf-8 -*-

N = input()
FizzBuzzString = ''

for i in xrange(N):
    i += 1
    if i % 3 == 0 and i % 5 == 0:
        FizzBuzzString += 'FizzBuzz'
    elif i % 3 == 0:
        FizzBuzzString += 'Fizz'
    elif i % 5 == 0:
         FizzBuzzString += 'Buzz'
    else:
         FizzBuzzString += str(i)

print FizzBuzzString.count('z')