Forest Road

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

namespace ForestRoad
{
    class ForestRoad
    {
        static void Main(string[] args)
        {
            int numberN = int.Parse(Console.ReadLine());
            int starPosition = 1;
            for (int j = 1; j <= (numberN * 2) - 1; j++)
            {
                for (int k = 1; k <= numberN; k++)
                {
                    if (starPosition == k)
                    {
                        Console.Write("*");
                    }
                    else
                    {
                        Console.Write(".");
                    }
                }
                if (j < numberN)
                {
                    starPosition++;
                }
                else
                {
                    starPosition--;
                }
                Console.WriteLine();
            }
        }
    }
}