




def 							_A       (						lowerCAmelCase_					: float      ):
     """simple docstring"""

     if edge <= 0 or not isinstance(lowerCAmelCase_       ,    lowerCAmelCase_      ):
          raise ValueError("Length must be a positive."      )
     return 3 * ((25 + 10 * (5 ** (1 / 2))) ** (1 / 2)) * (edge**2)



def 							_A       (						lowerCAmelCase_					: float      ):
     """simple docstring"""

     if edge <= 0 or not isinstance(lowerCAmelCase_       ,    lowerCAmelCase_      ):
          raise ValueError("Length must be a positive."      )
     return ((15 + (7 * (5 ** (1 / 2)))) / 4) * (edge**3)


if __name__ == "__main__":
     import doctest

     doctest.testmod()






def 							_A       (						lowerCAmelCase_					: int = 1000      ):
     """simple docstring"""

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


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