def FizzBuzzStr(N):
    c=''
    for i in range(1,N+1):
        if i%3==0 and i%5==0 :a='FizzBuzz'
        elif i%3==0:a='Fizz'
        elif i%5==0:a='Buzz'
        else:a=str(i)
        c+=a
    return c.count('z')

N=int(input())
print(FizzBuzzStr(N))