import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner scan =new Scanner (System.in);
        int i = scan.nextInt();
        int j = scan.nextInt();
        if(i>=0 && j>=0 && hasNextInt())
        {
            System.out.println(i+j);
        }
        else 
        {
            System.out.println("Invalid input");
        }
        
    }
}