public static void Main()
int n = int.Parse(Console.ReadLine());
int rightElement = n - 1;
for (int i = 0; i < n / 2; i++)
for (int j = 0; j <= n - 1; j++)
else if (rightElement == j)
for (int i = 0; i <= n - 1; i++)
for (int i = 0; i < n / 2; i++)
for (int j = 0; j <= n - 1; j++)
else if (rightElement == j)