Exception Handling/ Task - 1 IntegerSqrtRoot

using System;
class IntegerSquareRoot
{
    static void Main()
    {
        string input = Console.ReadLine();
        try
        {
            int num = int.Parse(input);
            Console.WriteLine(Math.Sqrt(num));
        }
        catch (FormatException)
        {
            Console.WriteLine("Invalid number.");
        }
        catch (ArgumentException)
        {
            Console.WriteLine("Invalid number.");
        }
        catch (OverflowException)
        {
            Console.WriteLine("Invalid number.");
        }
        finally
        {
            Console.WriteLine("Good bye.");
        }
    }
}