import java.util.Scanner;


public class Main_yukicoder240 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        x = sc.nextInt();
        y = sc.nextInt();

        if (dfs(0, 0, 0)) {
        	System.out.println("YES");
        } else {
        	System.out.println("NO");
        }
        
        sc.close();
    }

    private static int x;
    private static int y;
    private static int[] dx = {1, 1, 2, 2, -1, -1, -2, -2};
    private static int[] dy = {2, -2, 1, -1, 2, -2, 1, -1};
    
	private static boolean dfs(int xx, int yy, int i) {
		if (xx == x && yy == y) {
			return true;
		}

		if (i == 3) {
			return false;
		}
		
		for (int j = 0; j < dx.length; j++) {
			int tmpx = xx + dx[j];
			int tmpy = yy + dy[j];
			if (dfs(tmpx, tmpy, i + 1)) {
				return true;
			}
		}

		return false;
	}
}