import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while(true){
            int sum1 = in.nextInt();
            int sum2 = in.nextInt();
            if(sum1==0&&sum2==0){
                break;
            }else{
                System.out.println(sum1+sum2);
            }
        }


    }
}