def getFizzBuzzString(num):
    text = ''
    for i in range(num):
        cur = i + 1
        if ((cur % 15) == 0):
            text = text + 'FizzBuzz'
        elif ((cur % 5) == 0):
            text = text + 'Buzz'
        elif ((cur % 3) == 0):
            text = text + 'Fizz'
        else:
            text = text + str(i)
    return text

def count(text):
    count = 0
    for w in text:
        if w == 'z':
            count = count + 1
    return count

input = input()
split_input = input.split()

number = int(split_input[0])

text = getFizzBuzzString(number)

print(count(text))