StripedTowel

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

namespace StripedTowel
{
    class StripedTowel
    {
        static void Main()
        {
            int width = int.Parse(Console.ReadLine());
            int height = (int)Math.Floor(width * 1.5D);
            string row = "";
            List<string> hack = new List<string>();

            for(int i = 1; i <= 3; i++)
            {
                if(i % 2 == 0 )
                {
                    string pattern = "..#";
                    for(int a = 0; a < width; a++)
                    {
                       row += pattern;
                    }
                }
                else if(i % 3 == 0)
                {
                    string pattern = ".#.";

                    for(int a = 0; a < width; a++)
                    {
                        row += pattern;
                    }
                }
                else
                {
                    string pattern = "#..";
                    for(int a = 0; a < width; a++)
                    {
                        row += pattern;
                    }
                }

                hack.Add(row.Remove(width));
                row = "";
            }
            int rows = 0;
            for(int i = 0; i < height; i++)
            {
                Console.WriteLine(hack[rows]);
                rows++;
                if(rows == 3 )
                {
                    rows = 0;
                }
            }

        }
    }
}