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

int main()
{
long long A;
long long B;

	ios::sync_with_stdio( false );
	cin.tie( 0 );

	cin >> A;
	cin >> B;
	if( A == 1 && B == 1 )
		cout << "No" << endl;
	else
		cout << "Yes" << endl;

	return 0;
}