import java.io.*;
import java.util.Scanner;
 
public class Main {
 
public static void main(String[] args)throws IOException
{
    Scanner reader = new Scanner(new FileInputStream("adunare.in"));
    int a = reader.nextInt();
    int b = reader.nextInt();
    int sum = a + b;
 
    PrintWriter writer = new PrintWriter("adunare.out");
    writer.write(sum + String.valueOf(sum) + "\n");
    writer.close();
    reader.close();
}
 
}