KaspichanBoat

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

namespace KaspichaniaBoats
{
    class KaspichaniaBoats
    {
        static void Main()
        {
            int n = int.Parse(Console.ReadLine());

            int outerDots = n;
            int innerDots = 0;

            for (int i = 0; i < n; i++)
            {
                Console.Write(new string('.', outerDots));
                if (i != 0)
                {
                    Console.Write("*");
                }
                Console.Write(new string('.', innerDots));
                Console.Write("*");
                Console.Write(new string('.', innerDots));
                if (i != 0)
                {
                    Console.Write("*");
                }
                Console.WriteLine(new string('.', outerDots));

                outerDots--;
                if (outerDots < n - 1)
                {
                    innerDots++;
                }
            }
            Console.WriteLine(new string('*', 2 * n + 1));

            outerDots = 1;
            innerDots = n - 2;

            for (int i = n / 2 + 1; i > 0 ; i--)
            {
                Console.Write(new string('.', outerDots));
                if (i != 0)
                {
                    Console.Write("*");
                }
                if (i == 1)
                {
                    Console.Write(new string('*', innerDots));
                }
                else
                {
                    Console.Write(new string('.', innerDots));
                }
                Console.Write("*");
                if (i == 1)
                {
                    Console.Write(new string('*', innerDots));
                }
                else
                {
                    Console.Write(new string('.', innerDots));
                }
                if (i != 0)
                {
                    Console.Write("*");
                }

                Console.WriteLine(new string('.', outerDots));

                outerDots++;
                innerDots--;

            }
        }
    }
}