using System;
using System.Net.NetworkInformation;

namespace MacConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(FetchMacId());

            Console.ReadLine();
        }

        public static string FetchMacId()
        {
            string macAddresses = "";

            foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
            {
                if (nic.OperationalStatus == OperationalStatus.Up)
                {
                    macAddresses += nic.GetPhysicalAddress().ToString();
                    break;
                }
            }
            return macAddresses;
        }
    }
}