trapezoid

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

namespace Task03
{
    class Task03
    {
        static void Main(string[] args)
        {
            byte n = byte.Parse(Console.ReadLine());
            int pad = 2 * n;
            string [,] trapezoid = new string[(n+1),(n*2)];
            for (int i = 0; i < trapezoid.GetLength(0); i++)
            {
                for (int j = 0; j < trapezoid.GetLength(1); j++)
                {
                    if (i == n)
                    {
                        trapezoid[i, j] = "*";
                    }
                    else if (i == 0 && j >= n)
                    {
                        trapezoid[i, j] = "*";
                    }
                    else
                    {
                        trapezoid[i, j] = ".";
                        trapezoid[i, n - i] = "*";
                        trapezoid[i, (2 * n)-1] = "*";
                    }


                }
            }
            for (int i = 0; i < trapezoid.GetLength(0); i++)
            {
                for (int j = 0; j < trapezoid.GetLength(1); j++)
                {
                    Console.Write(trapezoid[i, j]);
                }
                Console.WriteLine();
            }
        }
    }
}