Trapezoid

using System;
class Trapezoid
{
  static void Main()
  {
    //Write a program that prints on the console the border of a trapezoid by given number N.
    //The width of the top side of the trapezoid must be exactly N.
    //The width of the bottom side of the trapezoid must be exactly 2 * N.
    //The height of the trapezoid must be exactly N + 1.
    //Also the top right and the bottom right angle of the trapezoid must be equal to 90 degrees.
    //On the only line in the console you are given an integer number N, showing the width of the smallest trapezoid side.

    int smallSide = byte.Parse(Console.ReadLine());
    int starPosition = smallSide;

    for (int row = 1; row <= (smallSide + 1); row++)
    {
      for (int column = 1; column <= (2 * smallSide); column++)
      {
        //if we are at the first row
        if (row == 1)
        {
          if (column <= smallSide)
          {
            Console.Write(".");
          }
          else if (column > smallSide)
          {
            Console.Write("*");
          }
          continue;
        }

        //If we are at the last row
        if (row == (smallSide + 1))
        {
          Console.Write("*");
          continue;
        }

        //If it is the middle rows
        if (starPosition == column)
        {
          Console.Write("*");
          starPosition--;
        }
        else if (column == (2*smallSide))
        {
          Console.Write("*");
        }
        else
          Console.Write(".");
      }
      Console.WriteLine("");
    }
  }
}