using System;

public class Program

{

    public static void Main()

    {

        int num,x=1;

    Console.WriteLine("please enter number:");

    while(int.TryParse(Console.ReadLine(),out num))

    {

        while(x<=num*num)

     {

    Console.Write("*");

    if(x%num==0)

    Console.WriteLine("*");

    x++;

     }

    Console.WriteLine("please enter anumber:"); 

    x=1;

    }

    Console.WriteLine("end of program:");   

    }

}