C++ :

#include <iostream>
using namespace std;
int main(){
    int a,b;
    while(cin >> a >> b)
        cout << a+b << endl;
	return 0;
}

Pascal :

var 

  a,b:Integer; 

begin 

   Readln(a,b); 

   Writeln(a+b); 

end.

C# :

using System;

  class  Acm1000

  {

    static void Main()

    {

      string[] ss = Console.ReadLine().Split();

      Console.WriteLine(long.Parse(ss[0]) + long.Parse(ss[1]));

   }

 }