using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            double a, b, c;
            a = double.Parse(Console.ReadLine());
            b = double.Parse(Console.ReadLine());
            c = double.Parse(Console.ReadLine());

            string ans = (Math.Ceiling(a / b) * 2d / 3d >= Math.Ceiling(a / c)) ? "YES" : "NO";
            Console.WriteLine(ans);
        }
    }
}