Boat

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

namespace Boat
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());

            var outerAsterisk = 0;

            for (int i = 0; i < n / 2 + 1; i++)
            {
                string row = new string('.', (n - 1) - outerAsterisk) + new string('*', outerAsterisk) + "*" +
                             new string('.', n);
                Console.WriteLine(row);
                outerAsterisk += 2;
            }

            var anotherAsterisk = (n - 3);

            for (int i = 1; i < n / 2 + 1; i++)
            {
                string row = new string('.', (n - 1) - anotherAsterisk) + new string('*', anotherAsterisk) + "*" +
                             new string('.', n);
                Console.WriteLine(row);
                anotherAsterisk -= 2;
            }

            for (int i = 0; i < n / 2; i++)
            {
                string row = new string('.', i) + new string('*', 2*n - 2*i) + new string('.', i);
                Console.WriteLine(row);
            }

        }
    }
}