C:
/* This also shows how to use 64-bit integer. */
#include <stdio.h>
int main()
{
    long long a,b;
    while(scanf("%lld%lld",&a,&b)!=EOF) printf("%lld\n",a+b);
    return 0;
}

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
    while(not eof(input)) do
    begin
        readln(a,b);
        writeln(a+b);
    end;
end.

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