n = int(input())
s = ""
for i in range(1, n + 1):
    flg = False
    if i % 3 == 0:
        s += "Fizz"
        flg = True
    if i % 5 == 0:
        s += "Buzz"
        flg = True
    if not flg:
        s += str(i)
print(s.count("z"))