#include <iostream>

using namespace std;

int main() {
	int n, m, c;
	cin >> n >> m >> c;
	bool possible;
	if (n == 1) {
		possible = (m == 2);
	} else if (n == 2) {
		possible = true;
	} else if (n % 2 == 1) {
		possible = (m % 2 == 0);
	} else {
		possible = (m >= 2);
	}
	cout << (possible ? "YES" : "NO") << endl;
	return 0;
}