using System;

using System.Xml;

using System.Xml.Serialization;

using System.IO;

using System.Linq;

using System.Collections;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        Utils.isPowerOf2(4).Dump();

        Utils.isPowerOf2(13).Dump();

    }   

}

​

public class Utils

{

   // ...

​

   public static bool isPowerOf2(dynamic x) 

   {

      return (x != 0) && ((x & (~x + 1)) == x);

   }

}