Willbe.S - StripedTowel

using System;

class StripedTowel
{
    static void Main()
    {
        int width = int.Parse(Console.ReadLine());
        int height = (int)(width * 1.5);
        string pattern = "#..";


        for (int i = 0; i < height; i++)
        {
            for (int j = i % 3; j < width + i % 3; j++)
            {
                int index = j % 3;
                Console.Write(pattern[index]);
            }
            Console.WriteLine();
        }
    }
}