


"""simple docstring"""
from math import ceil

def 				_snake_case      (   __snake_case							:      int = 1001   ):




   """simple docstring"""







   _lowerCamelCase	:					Dict   =		1

   for i in range(1						, int(ceil(n / 2.0   )   )   ):
      _lowerCamelCase	:					List[str]   =		2 * i + 1
      _lowerCamelCase	:					Optional[Any]   =		2 * i
      _lowerCamelCase	:					int   =		total + 4 * odd**2 - 6 * even

   return total


if __name__ == "__main__":
 import sys

 if len(sys.argv) == 1:
  print(solution())
 else:
  try:
   UpperCAmelCase				=						int(sys.argv[1])
   print(solution(n))
  except ValueError:
   print("""Invalid entry - please enter a number""")





def 						_lowerCAmelCase							(     _lowerCAmelCase = 100			)    ->						int:


						'''simple docstring'''






						__snake_case				=		n * (n + 1) * (2 * n + 1) / 6
						__snake_case				=		(n * (n + 1) / 2) ** 2
						return int(square_of_sum - sum_of_squares			)


if __name__ == "__main__":
	print(f'''{solution() = }''')





