package yukicorder;

import java.util.Scanner;

public class No_218 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		double a = sc.nextDouble();
		double b = sc.nextDouble();
		double c = sc.nextDouble();

		int normal = (int)Math.ceil(a/b);
		int success = (int)Math.ceil(a/c);

		if(2 * normal >= 3 * success){
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
	}
}