import java.util.*;

public class Main {
    static int X;
    static int Y;
    static int [] dx = {-2,-2,-1,-1,1,1,2,2};
    static int [] dy = {1,-1,2,-2,2,-2,1,-1};
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        X = sc.nextInt();
        Y = sc.nextInt();
        if(move(0,0,0)){
            System.out.println("YES");
        }else{
            System.out.println("NO");
        }
    }
    static boolean move(int x, int y, int c){
        if(c>3){
            return false;
        }
        if(x==X&&y==Y){
            return true;
        }
        for(int i=0; i<8; i++){
            if(move(x+dx[i], y+dy[i], c+1)){
                return true;
            }
        }
        return false;
    }
}