using System;  

public class Exercise31  

{  

    public static void Main()

{

   int i,j,r;

   r = Convert.ToInt32(Console.ReadLine());   

   for(i=0;i<=r;i++)

   {

     for(j=1;j<=r-i;j++)

     Console.Write(" ");

     for(j=1;j<=2*i-1;j++)

     Console.Write("*");

     Console.Write("\n");

   }

   for(i=r-1;i>=1;i--)

   {

     for(j=1;j<=r-i;j++)

     Console.Write(" ");

     for(j=1;j<=2*i-1;j++)

       Console.Write("*");

     Console.Write("\n");

   }

  }

}

​

​