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

def count(text):
    return text.count('z')

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

number = int(split_input[0])
if (1 <= number and number <= 10 ** 18):
  text = getFizzBuzzString(number)
  print(count(text))