def main():
    n = int(input())
    nums = range(1, n + 1)

    for num in nums:
        if num % 3 == 0 and num % 5 == 0:
            num = "FizzBuzz"
        elif num % 3 == 0:
            num = "Fizz"
        elif num % 5 == 0:
            num = "Buzz"
        else:
            num = str(num)

    str_nums = "".join(nums)

    count = 0
    for j in str_nums:
        if j == "z":
            count += 1

    print(count)


if __name__ == "__main__":
    main()