import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		int b = scan.nextInt();
		int c = scan.nextInt();
		scan.close();
		int k1 = (int)Math.ceil((double)a / b);
		int k2 = (int)Math.ceil((double)a / c);
		double k3 = ((double)2.0 * k1 / 3.0);

		if(k2 <= k3) {
			System.out.println("YES");
		}else {
			System.out.println("NO");
		}

	}
}