using System;
public class Program
{
public static void Main()
var n = int.Parse(Console.ReadLine());
for (int var1=0; var1<n; ++var1)
for (int var2=0; var2<n; ++var2)
if (var1==0 || var1==n-1 || var2==0 || var2==n-1)
Console.Write("*");
}
else
Console.Write(" ");
Console.Write("\n");