import java.io.*;
import java.util.*;
import java.math.*;

class Main {
	
	static int goalX , goalY;
	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 out (Object o) {
		System.out.println(o);
	}
	
	public static void solve (int x , int y , int n) {
		if (x == goalX && y == goalY) {
			out("YES");
			System.exit(0);
		}
		if (n == 3) return;
		
		for (int i = 0; i < dx.length; i++) {
			solve(x + dx[i] , y + dy[i] , n + 1);
		}
	}
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		String[] line = br.readLine().split(" ");
		goalX = Integer.parseInt(line[0]);
		goalY = Integer.parseInt(line[1]);
		
		solve(0 , 0 , 0);
		
		out("NO");
	}
}