using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    public void Solve()
    {
        int a = int.Parse(Console.ReadLine());
        int b = int.Parse(Console.ReadLine());
        int c = int.Parse(Console.ReadLine());

        decimal maxB = Math.Ceiling((decimal)a / b);
        decimal maxC = Math.Ceiling((decimal)a / c);

        Console.WriteLine(maxC <= maxB * 2 / 3 ? "YES" : "NO");
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}