using System;

using System.Globalization;

using System.Text;

namespace Egh

{

public class Program

{

public static void Main(string[] args)

{

while (true)

{

int a = int.Parse(Console.ReadLine());

int b = int.Parse(Console.ReadLine());

Console.WriteLine(a + b);

if (a == 0 && b == 0)

{

return;

}

}

}

}

}