using System;

​

//判斷是否是四的倍數

public class Program

{

    public static void Main()

    {

        int num =16;

        //用 log 解 

        //Console.WriteLine((Math.Log(64,4)));

        if((int)Math.Log(num,4) == Math.Log(num,4)) Console.WriteLine("4的"+Math.Log(num,4)+"倍");

        //--Log end

        if(num<4 && num!=1){

            num=num;

        }

        else

        {

            while(num>1)

            {

                if(num%4==0){

                    num = num/4;

                }

                else{

                    break;

                }

            }

        }

        Console.WriteLine(num==1 ? true : false);

    }

}