



'''simple docstring'''



def   _A       (   _lowerCAmelCase = 1_000					):



							"""simple docstring"""



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


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








'''simple docstring'''



from typing import TYPE_CHECKING

from ...utils import _LazyModule


lowerCamelCase	 =       {"""tokenization_bertweet""": ["""BertweetTokenizer"""]}


if TYPE_CHECKING:
		from .tokenization_bertweet import BertweetTokenizer

else:
		import sys

		lowerCamelCase	 =       _LazyModule(__name__, globals()["""__file__"""], _import_structure, module_spec=__spec__)



