using System;

public class Test
{
	public static void Main()
	{
		decimal a = decimal.Parse(Console.ReadLine());
		decimal b = decimal.Parse(Console.ReadLine());
		decimal c = decimal.Parse(Console.ReadLine());
		
		decimal Nomal = Math.Ceiling( a / b );
		decimal Campaign = Math.Ceiling( a / c );
		decimal Best = Nomal * 2m / 3m ;
		
		Console.WriteLine( Campaign <= Best ? "YES" : "NO" );
	}
}