Crown

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

namespace _5.Crown
{
    class Crown
    {
        static void Main(string[] args)
        {
            // Exam - 7 May 2017
            int n = int.Parse(Console.ReadLine());

            int spaces = ((2 * n - 1) - 3) / 2;
            int firstDots = 0;
            int centralDots = 1;

            Console.Write("@");
            Console.Write(new string(' ', spaces));
            Console.Write("@");
            Console.Write(new string(' ', spaces));
            Console.WriteLine("@");
            spaces--;

            for (int row = 1; row <= n / 2 + 1; row++)
            {
                if (row == 1)
                {
                    Console.Write("*");
                    Console.Write(new string('.', firstDots));
                    Console.Write("*");
                    Console.Write(new string(' ', spaces));
                    Console.Write("*");
                    Console.Write(new string(' ', spaces));
                    Console.Write("*");
                    Console.Write(new string('.', firstDots));
                    Console.WriteLine("*");
                    firstDots++;
                    spaces -= 2;

                }

                else if (row != 1 && row != n / 2 + 1)
                {
                    if (spaces >= 0)
                    {
                        Console.Write("*");
                        Console.Write(new string('.', firstDots));
                        Console.Write("*");
                        Console.Write(new string(' ', spaces));
                        Console.Write("*");
                        Console.Write(new string('.', centralDots));
                        Console.Write("*");
                        Console.Write(new string(' ', spaces));
                        Console.Write("*");
                        Console.Write(new string('.', firstDots));
                        Console.WriteLine("*");
                        firstDots++;
                        spaces -= 2;
                        centralDots += 2;
                    }

                    else
                    {
                        Console.Write("*");
                        Console.Write(new string('.', firstDots));
                        Console.Write("*");
                        Console.Write(new string('.', centralDots));
                        Console.Write("*");
                        Console.Write(new string('.', firstDots));
                        Console.WriteLine("*");
                        firstDots++;
                        spaces -= 2;
                        centralDots += 2;
                    }
                }

                else if (row == n / 2 + 1)
                {
                    int stars = (((2 * n - 1) - (2 * firstDots)) - 3) / 2;
                    Console.Write("*");
                    Console.Write(new string('.', firstDots));
                    Console.Write(new string('*', stars));
                    Console.Write(".");
                    Console.Write(new string('*', stars));
                    Console.Write(new string('.', firstDots));
                    Console.WriteLine("*");
                }
            }

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