#coding:utf-8

N=input()

s=''
for i in range(1,N+1):
	if i%3==0 and i%5==0:
		s+='FizzBuzz'
	elif i%3==0:
		s+='Fizz'
	elif i%5==0:
		s+='Buzz'
	else:
		s+='i'

print s.count('z')