백준 #5717번 상근이의 친구들

import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int a = sc.nextInt();
		int b = sc.nextInt();
		
		while(a != 0 && b != 0) {
			System.out.println(a + b);
			a = sc.nextInt();
			b = sc.nextInt();
		}
		sc.close();
	}
}