public static void Main()
int n = int.Parse(Console.ReadLine());
int[,] matrix = new int[3, 6];
Console.Write(new string('*', 2 * n - 2));
Console.Write(new string(' ', n - 1));
Console.Write(new string('*', 2 * n - 2));
for (int i = 0; i < n - 2; i++)
Console.Write(new string('/', 2 * n - 2));
Console.Write(new string('-', n - 1));
Console.Write(new string('/', 2 * n - 2));
Console.Write(new string('/', 2 * n - 2));
Console.Write(new string(' ', n - 1));
Console.Write(new string('/', 2 * n - 2));
Console.Write(new string('*', 2 * n - 2));
Console.Write(new string(' ', n - 1));
Console.Write(new string('*', 2 * n - 2));