#include <iostream>

using namespace std;

void solve()
{
	int r, c;
	while(cin >> r >> c, r || c)
	{
		if(r * c % 2)
		{
			cout << "no" << endl;
		}
		else
		{
			cout << "yes" << endl;
		}
	}
}

int main()
{
	solve();
	return(0);
}