package yukicoder;

import java.util.Scanner;

public class N240 {
	public int x, y;
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int y = sc.nextInt();
		N240 hoge = new N240(x, y);
	}
	
	N240(int x, int y){
		this.x = x;
		this.y = y;
		if(this.hoge(0, 0, 0)){
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
	}
	
	public boolean hoge(int x, int y, int c){
		if(x == this.x && y == this.y){
			return true;
		}
		if(c >= 3){
			return false;
		}
		return(hoge(x-2, y-1, c+1) || hoge(x-2, y+1, c+1) || hoge(x-1, y-2, c+1) || hoge(x-1, y+2, c+1) || hoge(x+1, y-2, c+1) || hoge(x+1, y+2, c+1) || hoge(x+2, y-1, c+1) || hoge(x+2, y+1, c+1));
	}
}