using System;
using System.IO;
using System.Management;
using System.Runtime.InteropServices;
using System.Text.RegularExpressions;

namespace IdTest
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            Console.WriteLine(GetCPUNumber());
        }

        public static string GetCPUNumber()
        {
            var result = string.Empty;
            if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
            {
                result = Regex.Match(File.ReadAllText("/proc/cpuinfo"), @"Serial\s*:\s*([^\s]+)").Groups[1].Value;
            }
            else
            {
                var mc = new ManagementClass("win32_processor");
                var moc = mc.GetInstances();

                foreach (ManagementObject mo in moc)
                {
                    if (result == "")
                    {
                        result = mo.Properties["processorID"].Value.ToString();
                        break;
                    }
                }
            }
            return result.ToLower();
        }
    }
}