# -*- coding: utf-8 -*-

a = list(map(int,input().split()))

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

a = "".join(a)

print(len(a))