/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;
import static java.lang.Math.*;

class Ideone {
	public static void main (String[] args) {
             Scanner sc = new Scanner(System.in);
             double x,y;
             x = sc.nextInt();
             y = sc.nextInt();
             if ((abs(x)+y<=4) && (y>=0)){
                  System.out.println("Yes");
             }
             else{
                  System.out.println("No");
             }
	}
}