C :

#include <stdio.h>

int main()
{
    int a,b;
    scanf("%d %d",&a, &b);
    printf("%d\n",a+b);
    return 0;
}

C++ :

#include<iostream>
using namespace std;

int main(void)
{
  int a,b;
  while(cin>>a>>b)
  {
    cout<<a+b<<endl;
  }
  return 0;
}

Java :

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