enum Step {
	p1(1, 2), p2(2, 1), p3(2, -1), p4(1, -2), p5(-1, -2), p6(-2, -1), p7(-2, 1), p8(-1, 2);
	int x, y;

	Step(int x, int y) {
		this.x = x;
		this.y = y;
	}
}

public class No_240 {
	static int decideX;
	static int decideY;

	public static void main(String[] args) {
		java.util.Scanner sc = new java.util.Scanner(System.in);
		decideX = sc.nextInt();
		decideY = sc.nextInt();
		String ans = "";

		if (Knight(0, 0, 0)) {
			ans = "YES";
		} else {
			ans = "NO";
		}

		System.out.println(ans);
		sc.close();

	}

	static boolean Knight(int x, int y, int c) {

		if (judge(x, y)) {
			return true;
		}
		if (c >= 3) {
			return false;
		}
		for (Step s : Step.values()) {
			int nextX = x + s.x;
			int nextY = y + s.y;
			if (Knight(nextX, nextY, c + 1)) {
				return true;
			}
		}
		return false;
	}

	static boolean judge(int x, int y) {
		if (decideX == x && decideY == y) {
			return true;
		} else {
			return false;
		}
	}

}