Sunglasses

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

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

            char asterisk = '*';
            char whiteSpace = ' ';
            char forwardSlash = '/';
            char pipe = '|';

            string rowToFormat = "*{0}*{1}*{0}*";

            int countOfMiddleSymbols = size * 2 - 2;

            string firstAndLastRow = string.Format(rowToFormat,
                                                   new string(asterisk, countOfMiddleSymbols),
                                                   new string(whiteSpace, size));

            Console.WriteLine(firstAndLastRow);

            int rows = size - 2;

            int rowOfNeshtoSi = (int)(Math.Ceiling(size / 2.0) - 2);
            for (int currentRow = 0; currentRow < rows; currentRow++)
            {
                char currentMiddleSymbol = whiteSpace;
                if (currentRow == rowOfNeshtoSi)
                {
                    currentMiddleSymbol = pipe;
                }

                string formattedRow = string.Format(rowToFormat,
                                                    new string(forwardSlash, countOfMiddleSymbols),
                                                    new string(currentMiddleSymbol, size));

                Console.WriteLine(formattedRow);
            }

            Console.WriteLine(firstAndLastRow);
        }
    }
}