public static void Main()
int n = int.Parse(Console.ReadLine());
for (int i = 1; i <= n; i++)
for (int x = 1; x <= 5 * n; x++)
if (x == 3 * n + 1 || x == 3 * n + 1 + i)
for (int i = 0; i < n/2; i++)
for (int x = 1; x <= 5 * n; x++)
if (x <= 3 * n + 1 || x == 4 * n + 1)
for (int i = 0; i < n / 2; i++)
for (int x = 1; x <= 5 * n; x++)
if ( i == n / 2 - 1 && x >= 3 * n - i + 1 && x <= 4 * n + 1 + i)
else if (x == 3 * n - i + 1 || x == 4 * n + 1 + i)