This short program so that instead of the first value, the program prints the sum of the second and third numbers. The program is allowed to malfunction if there are fewer than three entries on the list.

import java.util.ArrayList;
import java.util.Scanner;

public class SecondPlusThird {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        ArrayList<Integer> numbers = new ArrayList<>();
        while (true) {
            int number = Integer.valueOf(scanner.nextLine());
            if (number == 0) {
                break;
            }

            numbers.add(number);
        }

        System.out.println(numbers.get(1) + numbers.get(2));
    }
}
Output: 
1
3
5
7
0
8