Задача 1

using System;

    class Program
    {
        static void Main(string[] args)
        {






            try
            {




                        Console.WriteLine("Enter a number:");
                        int num = int.Parse(Console.ReadLine());

                        if(num < 0)
                        {

                                throw new ArithmeticException();

                        }


                        Math.Sqrt(num);
                        Console.WriteLine(Math.Sqrt(num));

            }
            catch(FormatException )
            {

                        Console.WriteLine("Invalid number");

            }
            catch (OverflowException)
            {

                        Console.WriteLine("Invalid number");
            }
            catch(ArithmeticException){

                        Console.WriteLine("Negative number");

            }
            finally
            {

                Console.WriteLine("Goodbye!");

            }
        }
    }