using System;

public class Program

{

    public static void Main()

    {

        const int maxi = 4, maxj = 13;

            char[,] arrayD = new char[maxi, maxj];

            bool flag = true;

            for (int i = 0, int j = 0; j < maxj; j++)

            {

                arrayD[i, j] = '*';

                flag? i++ : i--;

                if (flag && i == 3) flag = false;

                if (!flag && i == 0) flag = true;

            }

​

​

​

            for (int i = 0; i < maxi; i++)

            {

                for (int j = 0; j < maxj; j++)

                {

                    Console.Write(arrayD[i, j]);

                }

                Console.Write('\n');

            }

    }

​

}