Практикум 3, задание 1, номер 11

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace mainSolution
{
    public class MyException : Exception
    {
        public MyException(string messege) : base(message: messege + "\n\n\n Exception founded by Decibit\n\n\n") { }
        public MyException() : base()
        {

        }
        public void Messsage()
        {
            Console.WriteLine("\n\n\n\n\n\n Invalid number, please enter a number from 1 to 10 \n\n\n\n\n\n");
        }


    }
    class Input
    {
        private static IEnumerator<string> getin()
        {
            while (true)
                foreach (string s in Console.ReadLine().Split().Where(x => x.Length > 0))
                    yield return s;
        }

        private IEnumerator<string> inp = getin();

        public string GetString() { inp.MoveNext(); return inp.Current; }
        public int GetInt() { return int.Parse(GetString()); }
        public long GetLong() { return long.Parse(GetString()); }
        public double GetDouble() { return double.Parse(GetString()); }
    }

    static class Program
    {
        static public Input cin = new Input();



        static bool check(double x)
        {
            if (0 < x && x > 2)
                return true;
            else
                return false;
        }
        static void Main(string[] args)
        {

            double x = cin.GetDouble();
            if (check(x))
                Console.WriteLine(Math.Log((x/x-2), Math.E));
            else
                Console.WriteLine("No Solution Exist");

        }
    }

}