03StriptedTower

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

namespace _03StriptedTowel
{
    class Program
    {
        static void Main(string[] args)
        {

            int n = int.Parse(Console.ReadLine());

            string a = "#..";
            int stringIndex = 0;
            int height = (int)Math.Floor(n * 1.5);
            char[] state = new char[n];
            char[] state2 = new char[n];
            char[] state3 = new char[n];

            int count = 0;

            for (int i = 0; i < n; i++)
            {
                stringIndex = i % a.Length;
                state[i] = a[stringIndex];
                // Console.Write(state[i]);
            }
            string b = "..#";
            for (int i = 0; i < n; i++)
            {
                stringIndex = i % b.Length;
                state2[i] = b[stringIndex];
                // Console.Write(state[i]);
            }
            string c = ".#.";
            for (int i = 0; i < n; i++)
            {
                stringIndex = i % c.Length;
                state3[i] = c[stringIndex];
                // Console.Write(state[i]);
            }



            for (int j = 0; j <height ; j++)
            {

                for (int i = 0; i < n; i++)
                {
                    int current = i;

                    if (j%3==0)
                    {
                        Console.Write("{0}", state[i]);
                    }
                    else if(j%3==1)
                    {
                        Console.Write("{0}", state2[i]);
                    }
                    else if (j % 3 == 2)
                    {
                        Console.Write("{0}", state3[i]);
                    }


                }
                Console.WriteLine();
            }


        }
    }
}