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); } } } }