#include<bits/stdc++.h>
using namespace std;
int main(){
    cout<<300<<endl<<3000<<endl<<40000<<endl<<-300;
    return 0;
}

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;
	
	return 0;
}

Java :

import java.util.Scanner;

public class Main 
{
	public static void main(String[] args) 
	{
		Scanner sc = new Scanner(System.in);

		while(sc.hasNextInt())
		{
			int a = sc.nextInt();
			int b = sc.nextInt();
			System.out.println(a+b);
		}
	}
}