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;
cin>>a>>b;
cout<<a+b<<endl;
return 0;
}

Java :

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