#include <iostream>
using namespace std;

int main() {
    while (true) {
        int r, c;
        cin >> r >> c;
        if ((r | c) == 0) {
            break;
        }
        if (r * c % 2 == 0) {
            cout << "yes" << endl;
        } else {
            cout << "no" << endl;
        }
    }
}