using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("nhap n: ");

        int n = int.Parse(Console.ReadLine());

        for ( int i = 1; i <= n; i ++)

        {

            for ( int z = 1;z <= n; z++)

            {

                if ( i == n || z == 1|| i == z)

                    Console.Write("*");

                else

                    Console.Write(" ");

            }

            Console.Write("\n");

        }

    }

}