N=int(input())
ans=""
for i in range(1, N+1):
    if i % len("ABC") == len("") and i % len("ABCDE") == len(""):
        ans += "FizzBuzz"
    elif i % len("ABC") == len(""):
        ans += "Fizz"
    elif i % len("ABCDE") == len(""):
        ans += "Buzz"
    else:
        ans += str(i)
print(ans.count("z"))