public static void Main()
Console.Write("Въведете число:");
int n = int.Parse(Console.ReadLine());
Console.Write(new string('*', 2 * n));
Console.Write(new string(' ', n));
Console.WriteLine(new string('*', 2 * n));
for (int i = 0; i < n - 2; i++)
Console.Write(new string('/', 2 * n - 2));
if (i == (n - 1) / 2 - 1)
Console.Write(new string('|', n));
Console.Write(new string('/', 2 * n - 2));
Console.Write(new string(' ', n));
Console.Write(new string('/', 2 * n - 2));
Console.Write(new string('*', 2 * n));
Console.Write(new string(' ', n));
Console.WriteLine(new string('*', 2 * n));
else Console.Write("Въведеното число е невалидно!");