


'''simple docstring'''







import math
import sys



def     _UpperCamelCase				(			UpperCamelCase__		):






				"""simple docstring"""



				if number != int(UpperCamelCase__		):
								raise ValueError("the value of input must be a natural number"		)
				if number < 0:
								raise ValueError("the value of input must not be a negative number"		)
				if number == 0:
								return 1
				__magic_name__					:       Dict    							=							[-1] * (number + 1)
				__magic_name__					:       int    							=							0
				for i in range(1  , number + 1		):
								__magic_name__					:       List[str]    							=							sys.maxsize
								__magic_name__					:       Union[str, Any]    							=							int(math.sqrt(UpperCamelCase__		)		)
								for j in range(1  , root + 1		):
												__magic_name__					:       str    							=							1 + answers[i - (j**2)]
												__magic_name__					:       Dict    							=							min(UpperCamelCase__  , UpperCamelCase__		)
								__magic_name__					:       Optional[Any]    							=							answer
				return answers[number]


if __name__ == "__main__":
		import doctest

		doctest.testmod()


def 							_lowerCamelCase   (			SCREAMING_SNAKE_CASE = 1000   ):
      '''simple docstring'''







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


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





