import java.util.Scanner;

/**
 * 链接:https://ac.nowcoder.com/acm/contest/320/C
 * 来源:牛客网
 *
 * 输入包括两个正整数a,b(1 <= a, b <= 10^9),输入数据有多组, 如果输入为0 0则结束输入
 */
public class Main_03 {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        for (; ; ) {
            int a = s.nextInt();
            int b = s.nextInt();
            if (a == 0 && b == 0) {
                break;
            }else {
                System.out.println(a + b);
            }
        }
    }
}