public class Main {

    public static void main(String[] args) {
        // 练习一
        int[] ns = { 1, 4, 9, 16, 25};
        for (int i = ns.length - 1; i > -1; i--) {
            System.out.println(ns[i]);
        }

        // 练习二
        int sum = 0;
        for (int n : ns) {
            sum += n;
        }
        System.out.println(sum);
    }

}