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

namespace ConsoleTryCatch4
{
    class Program
    {
        static void Main(string[] args)
        {
              int i = 1, n = 0, f = 0;
              while (true)
              {
                  try
                  {
                        Console.Write("n = ");
                        n = int.Parse(Console.ReadLine());
                        f = 1;
                        for (i = 1; i <= n; i++)
                       {
                             f = f * i;
                       }
                       break;
                  }
                  catch (InvalidCastException ex)
                 {
                       Console.WriteLine("資料型態錯誤");
                 }
                 catch (OverflowException ex)
                 {
                        Console.WriteLine("溢位錯誤");
                 }
                 catch (Exception ex)
                 {
                       Console.WriteLine("其他錯誤");
                 }
             }
             Console.WriteLine("{0} != {1}", n, f);
             Console.ReadLine();
        }
    }
}