Fir Tree

using System;
//Input
//The input data should be read from the console.
//On the only input line you have an integer number N, showing the height of the tree.
//The input data will always be valid and in the format described. There is no need to check it explicitly.
//Output
//The output data should be printed on the console.
//You must print the fir tree on the console. Each row contains only characters "." (point)  or "*" (asterisk).
//The first row should have exactly one "*" in the middle (that is the top of the tree) and each of the next lines two more.
//The last line should have exactly one asterisk in the middle, showing the stem of the tree.
class Program
{
    static void Main()
    {
        int hight = int.Parse(Console.ReadLine());
        int length = 1;
        for (int i = 2; i < hight; i++)
        {
            length += 2;
        }
        //Console.WriteLine(length);
        for (int j = 1; j <= length; j += 2)
        {

            for (int i = 1; i <= (length - j) / 2; i++)
            {
                Console.Write(".");
            }
            for (int i = 1; i <= j; i++)
            {
                Console.Write("*");
            }
            for (int i = 1; i <= (length - j) / 2; i++)
            {
                Console.Write(".");
            }
            Console.WriteLine();
        }
        //last row
        for (int i = 1; i <= length / 2; i++)
        {
            Console.Write(".");
        }
            Console.Write("*");
        for (int i = 1; i <= length/ 2; i++)
        {
            Console.Write(".");
        }
        Console.WriteLine();

    }
}