03.Summertime For Programmers

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

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

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

    }
}