DrawFort

using System;

namespace DrawFort
{
    class Program
    {
        static void Main()
        {
            var input = ushort.Parse(Console.ReadLine());
            var width = (ushort)(input * 2);//Width of the fort
            var numberOfCarets = (ushort)(input / 2);//The number of '^' symbols  in a single sequence
            var numberOfUnderscores = (ushort)(width - (numberOfCarets * 2) - 4);//The number of '_' symbols in a single sequence

            var underscores = new string('_', numberOfUnderscores);
            var carets = new string('^', numberOfCarets);

            for (ushort row = 0; row < input; row++)
            {
                if (row == 0) Console.WriteLine(@"/{0}\{1}/{0}\", carets, underscores);
                else if (row == input - 2) Console.WriteLine(@"|{0}{1}{0}|", new string(' ', (width - numberOfUnderscores - 2) / 2), underscores);
                else if (row == input - 1) Console.WriteLine(@"\{0}/{1}\{0}/", new string('_', input/2), new string(' ', 2 * (input - numberOfCarets) - 4));
                else Console.WriteLine("|{0}|", new string(' ', width - 2));
            }
        }
    }
}