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

public class No0240 {

	static final Scanner in = new Scanner(System.in);
	static final PrintWriter out = new PrintWriter(System.out,false);

	static void solve() {
		X = in.nextInt();
		Y = in.nextInt();
		out.println(rec(0,0,0) ? "YES" : "NO");
	}

	static int X,Y;

	static int[] dx = {-2,-2,-1,-1,1,1,2,2};
	static int[] dy = {-1,1,-2,2,-2,2,-1,1};

	static boolean rec(int x, int y, int depth) {
		if (x == X && y == Y) return true;
		if (depth == 3) return false;
		for (int i=0; i<8; i++) {
			if (rec(x+dx[i],y+dy[i],depth+1)) {
				return true;
			}
		}
		return false;
	}

	public static void main(String[] args) {
		long start = System.currentTimeMillis();

		solve();
		out.flush();

		long end = System.currentTimeMillis();
		//trace(end-start + "ms");
		in.close();
		out.close();
	}

	static void trace(Object... o) { System.out.println(Arrays.deepToString(o));}
}