using System;

public class Test
{
	public static void Main()
	{
        double a = double.Parse(Console.ReadLine());
        double b = double.Parse(Console.ReadLine());
        double c = double.Parse(Console.ReadLine());

        double cntNormal = Math.Ceiling( a / b );
        double cntCampaing = Math.Ceiling( a / c );
        double Hoge = Math.Ceiling( cntNormal * 0.66 );

        Console.WriteLine(Hoge >= cntCampaing ? "YES" : "NO");
	}
}