using System;

public class Test
{
	static void Main( string[] args )
    {
        int needExp = int.Parse(Console.ReadLine());
        int nmlExp = int.Parse(Console.ReadLine());
        int cmpExp = int.Parse(Console.ReadLine());
                    
        int cmpNeedItems = ( needExp / cmpExp );
        if (( needExp % cmpExp ) > 0)
        {
            cmpNeedItems++;
        }
        
        Console.WriteLine( cmpNeedItems <= ( ( needExp / nmlExp ) * 2 / 3 ) ? "YES" : "NO");
    }
}