import java.util.Scanner;

public class Yukicoder85 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt(), m = sc.nextInt();
		sc.next();
		if (((n * m) % 2 == 0 && n > 1 && m > 1) || n * m == 2)
			System.out.println("YES");
		else
			System.out.println("NO");
	}
}