Summertime

using System;

class Program
{
    static void Main()
    {

        int n = int.Parse(Console.ReadLine());
        int bottleBottom = 2 * n;
        int bottleTop = n + 1;

        int outside = (bottleBottom - bottleTop) / 2;
        int inside = bottleTop - 2;

        Console.WriteLine("{0}{1}",
            new string(' ', outside),
            new string('*', bottleTop));

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

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

        }

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


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

        Console.WriteLine(new string('*', bottleBottom));
    }
}