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

    for i in range(len(nums)):
        if nums[i] % 3 == 0 and nums[i] % 5 == 0:
            nums[i] = "FizzBuzz"
        elif nums[i] % 3 == 0:
            nums[i] = "Fizz"
        elif nums[i] % 5 == 0:
            nums[i] = "Buzz"
        else:
            nums[i] = str(nums[i])

    str_nums = "".join(nums)

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

    print(count)


if __name__ == "__main__":
    main()