n = int(input())
fizz_buzz_string=""
for i in range(1,n+1):
    if i%3==0 and i%5==0:
        fizz_buzz_string = fizz_buzz_string + "FizzBuzz"
    elif i%3 == 0:
        fizz_buzz_string = fizz_buzz_string + "Fizz"
    elif i%5 == 0:
        fizz_buzz_string = fizz_buzz_string + "Buzz"
    else:
        fizz_buzz_string = fizz_buzz_string + str(i)

print(fizz_buzz_string.count("z"))