public static void Top(int c)
for(int a = 1; a <= c;a++)
for (int b = 1; b <= c - a; b++)
for ( int b = 1; b <= a; b++)
public static void Bot(int c)
for(int a = c-1; a >= 1;a--)
for (int b = 1; b <= c ; b++)
for ( int b = 1; b <= a; b++)
public static void Main()
int n = int.Parse(Console.ReadLine());