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

class Magatro
{
    static void Main()
    {
        int a, b, c;
        a = int.Parse(Console.ReadLine());
        b = int.Parse(Console.ReadLine());
        c = int.Parse(Console.ReadLine());
        int bcnt = a % b == 0 ? a / b : a / b + 1;
        int ccnt = a % c == 0 ? a / c : a / c + 1;
        if ((double)bcnt * 2.0/3.0 >= ccnt)
        {
            Console.WriteLine("YES");
        }
        else
        {
            Console.WriteLine("NO");
        }
    } 
}