def fizzbuzz(N:list):
    _ = []
    for n in N:
        np3 = n % 3 == 0
        np5 = n % 5 == 0
        if np3 or np5:
            s = ""
            if np3:
                s+="Fizz"
            if np5:
                s+="Buzz"
        else:
            s = str(n)
        _.append(s)
    return _

N = [int(x) for x in input().split()]
fb = fizzbuzz(N)
my_length = sum(map(len,fb))
print(my_length)