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();
        if(a > b) {
            long tmp = a;
            a = b;
            b = tmp;
        }

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

        System.out.println(ans);
    }
}