#include <iostream>
using namespace std;

int main() {
    int a, b, c;
    cin >> a >> b >> c;
    b = a / b + (a % b ? 1 : 0);
    c = a / c + (a % c ? 1 : 0);
    cout << (c * 3 <= 2 * b  ? "YES" : "NO") << endl;
    return 0;
}