#include <iostream>
using namespace std;

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