import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        Long a = in.nextLong();
        Long b = in.nextLong();

        String ans = "Yes";

        if(a == 0 && b == 0) {

        } else if(a == b && a != 4 && b != 4) {
            ans = "No";
        } else if(a % 2 != 0 && b % 2 != 0) {
            ans = "No";
        } else if(a % 2 == 0 && b % 2 == 0) {
            if(a > b && b != 0) {
                if((a/b)%2 != 0) ans = "No";
            } else if(b > a && a != 0) {
                if((b/a)%2 != 0) ans = "No";
            }
        } else {
            if(a % 2 == 0 && b % 2 != 0)
                if((a-b) == 1) ans = "No";
            if(b % 2 == 0 && a % 2 != 0)
                if((b-a) == 1) ans = "No";
        }

        System.out.println(ans);
    }
}