Striped Towel

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

namespace Exam30August2015
{
    class StripedTowel
    {
        static void Main()
        {
            int width = int.Parse(Console.ReadLine());
            double height= Math.Floor(width * 1.5);
            string symbol = "";
            int counter = 1;

            for (int i = 0; i < height; i++)
            {
                for (int j = 0; j < width; j++)
                {
                    if (counter==1)
                    {
                        symbol = "#..";
                    }
                    else if (counter == 2)
                    {
                        symbol = "..#";
                    }
                    else
                    {
                        symbol = ".#.";
                    }

                    if (j==0)
                    {
                        Console.Write(symbol[j]);
                    }
                    else
                    {
                        Console.Write(symbol[j % symbol.Length]);
                    }
                }
                counter++;
                if (counter>3)
                {
                    counter = 1;
                }
                Console.WriteLine();

            }
        }
    }
}