import java.io.*;
import java.util.*;
import java.math.*;

class Main {
	
	public static void out (Object o) {
		System.out.println(o);
	}
	
	public static boolean solve (int n , int m) {
		if (n == 1 || m == 1) return n == 2 || m == 2;
		return n % 2 == 0 || m % 2 == 0;
	}
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		String[] line = br.readLine().split(" ");
		
		int n = Integer.parseInt(line[0]);
		int m = Integer.parseInt(line[1]);
		
		out(solve(n ,m) ? "YES" : "NO");
	}
}