package no218;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();

		int normal = (a + b - 1) / b;
		int campaign = (a + c - 1) / c;
		if (normal * 2 >= campaign * 3) {
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
	}

}