C :

#include<stdio.h>
int main()
{
    int a,b;
    while(scanf("%d%d",&a,&b) != EOF) printf("%d\n",a+b);
    return 0;
}

C++ :

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

Java :

import java.util.Scanner;
public class Main
{
  public static void main(String[] args)
  {
    Scanner sc=new Scanner(System.in);
    while(sc.hasNext())
    {
      int i=sc.nextInt();
      int j=sc.nextInt();
      System.out.println(i+j);
    }
  }
}