import static java.lang.System.*;
import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	static int gx = sc.nextInt();
	static int gy = sc.nextInt();
	public static void main(String[] args) {
		out.println(dfs(0,0,0)?"YES":"NO");
	}
	static boolean dfs(int x, int y, int n) {
		if (x==gx && y==gy) return true;
		if (n>3) return false;
		return (
				dfs(x-2,y-1,n+1) ||
				dfs(x-2,y+1,n+1) ||
				dfs(x-1,y-2,n+1) ||
				dfs(x-1,y+2,n+1) ||
				dfs(x+1,y-2,n+1) ||
				dfs(x+1,y+2,n+1) ||
				dfs(x+2,y-1,n+1) ||
				dfs(x+2,y+1,n+1)
		);
	}
}