#include "bits/stdc++.h"
using namespace std;


int main(){
	int N, M;
	cin >> N >> M;
	if (N == 1 || M == 1){
		if (N * M == 2) cout << "YES" << endl;
		else cout << "NO" << endl;
	}
	else if (N % 2 && M % 2) cout << "NO" << endl;
	else cout << "YES" << endl;
}