


'''simple docstring'''

from abc import ABC, abstractmethod
from argparse import ArgumentParser
class     __lowerCAmelCase		(lowercase_	):





      '''simple docstring'''






      @staticmethod
      @abstractmethod
      def  UpperCamelCase__						(UpperCamelCase       :       ArgumentParser					):

             '''simple docstring'''







             raise NotImplementedError()






      @abstractmethod
      def  UpperCamelCase__						(self       :       int					):

             '''simple docstring'''







             raise NotImplementedError()








'''simple docstring'''

def _SCREAMING_SNAKE_CASE (A = 1_000			)			->			int:






       """simple docstring"""







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


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




