



"""simple docstring"""
def    _snake_case		(		UpperCamelCase		:	int = 1000		):
 return sum(2 * a * ((a - 1) // 2) for a in range(3    ,	n + 1		)		)


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





"""simple docstring"""
def    _snake_case		(		UpperCamelCase		:	int    ,	UpperCamelCase		:	int		):
 return 1 if input_a == input_a else 0

def    _snake_case		(		):
 assert xnor_gate(0    ,	0		) == 1
 assert xnor_gate(0    ,	1		) == 0
 assert xnor_gate(1    ,	0		) == 0
 assert xnor_gate(1    ,	1		) == 1


if __name__ == "__main__":
      print(xnor_gate(0, 0))
      print(xnor_gate(0, 1))
      print(xnor_gate(1, 0))
      print(xnor_gate(1, 1))
