import java.util.Scanner;
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc=new Scanner(System.in);
int a ,b;
while(sc.hasNext()) {
a=sc.nextInt();
b=sc.nextInt();
if(a==0&&b==0) {
break;
}
else {
System.out.println(a+b);
}
}
}
}