public static void main(String[] args) {
        int[] a = {2, 3, 2, 4, 3, 1, 6, 3, 2, 3};
        System.out.println("# of even: " + countEven(a, 0));

    }

    public static int countEven(int[] a, int from) {
        Scanner scan = new Scanner(System.in);
        int b = scan.nextInt();
        int even = 0;
        for (int i = b; i < a.length; i++) {
            if (i % 2 == 0) {
                even++;
            }
        }return even;
    }