package yukicorder;

import java.util.Scanner;

public class No_218 {
	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;
		int success = a / c;

		if(normal < 1.5 * success){
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
	}
}