This famous exercise helps you practice conditions and the order of checks. Write a function fizzbuzz that takes a number n and returns a string by these rules: if the number is divisible by 15, return FizzBuzz; if it is divisible only by 3, return Fizz; if it is divisible only by 5, return Buzz. If none of the rules match, return the number itself as a string.

def fizzbuzz(n: int) -> str: