
"""simple docstring"""






def 						_snake_case       (	lowercase__		:  int = 1_0_0_0		)  ->				int:


			'''simple docstring'''





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


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













def      _A       (		SCREAMING_SNAKE_CASE     :   int = 50						):





  """simple docstring"""



  a__	:					Any										=[1] * (length + 1)

  for row_length in range(3       ,       length + 1						):
    for block_length in range(3       ,       row_length + 1						):
      for block_start in range(row_length - block_length						):
        ways_number[row_length] += ways_number[
            row_length - block_start - block_length - 1
        ]

      ways_number[row_length] += 1

  return ways_number[length]


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






