import java.io.BufferedReader;
import java.io.InputStreamReader;

public class No240 {
    static int[] moveX = { -2, -2, -1, -1, +1, +1, +2, +2 };
    static int[] moveY = { -1, +1, -2, +2, -2, +2, -1, +1 };
    static int X;
    static int Y;

    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    System.in));

            int[] a = strToIntArray(br.readLine());
            X = a[0];
            Y = a[1];

            String ans = dfs(0, 0, 0);
            System.out.println(ans);
        } catch (Exception e) {
            e.printStackTrace();
            System.err.println("Error:" + e.getMessage());
        }
    }

    static String dfs(int currentX, int currentY, int count) {

        if (3 < count) {
            return "NO";
        }

        if (currentX == X && currentY == Y) {
            return "YES";
        }
        count++;
        for (int i = 0; i < moveX.length; i++) {

            if (dfs(currentX + moveX[i], currentY + moveY[i], count).equals(
                    "YES")) {
                return "YES";
            }
        }

        return "NO";
    }

    static int[] strToIntArray(String S) {
        String[] strArray = S.split(" ");
        int[] intArray = new int[strArray.length];
        for (int i = 0; i < strArray.length; i++) {
            intArray[i] = Integer.parseInt(strArray[i]);
        }
        return intArray;
    }
}