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

public class yukicoder
{
    public static void Main()
    {
        double a = double.Parse(Console.ReadLine());
        double b = double.Parse(Console.ReadLine());
        double c = double.Parse(Console.ReadLine());
        
        double x = Math.Ceiling(a / b);
        double y = Math.Ceiling(a / c);
        
        if(y <= (x * 2 / 3))
            Console.WriteLine("YES");
        else
            Console.WriteLine("NO");

    }
}