


"""simple docstring"""







def      UpperCAmelCase__ (lowerCAmelCase_ = 1000     ):




     '''simple docstring'''


     return sum(2 * a * ((a - 1) // 2) for a in range(3						,		n + 1     )     )


if __name__ == "__main__":
  print(solution())




"""simple docstring"""







from abc import ABC, abstractmethod
from argparse import ArgumentParser




class 				UpperCamelCase_			(				UpperCamelCase):

	"""simple docstring"""





	@staticmethod
	@abstractmethod
	def 						UpperCAmelCase_   (				UpperCAmelCase__    :       ArgumentParser     ) ->			Optional[Any]:
						raise NotImplementedError()




	@abstractmethod
	def 						UpperCAmelCase_   (				self    :       Optional[Any]     ) ->			List[str]:
						raise NotImplementedError()
