public static void fizzbuzz(Integer n) {
        for (int i = 1; i <= n; i++) {
            if (i % 3 == 0) {
                if (i % 5 == 0)
                    System.out.println("FizzBuzz");
                else
                    System.out.println("Fizz");
            } else if (i % 5 == 0) System.out.println("Buzz");
            else System.out.println(i);
        }
    }