def fizz_buzz_string(num: int) -> str:
    result = ""
    for i in range(num):
        if (i+1) % 3 == 0 and (i+1) % 5 == 0:
            result += "FizzBuzz"
        elif (i+1) % 3 == 0:
            result += "Fizz"
        elif (i+1) % 5 == 0:
            result += "Buzz"
        else:
            result += str(i+1)
    return result

print(fizz_buzz_string(int(input())).count('z'))