
from ...configuration_utils import PretrainedConfig
from ...utils import logging


_A   =			logging.get_logger(__name__)







class 					lowerCamelCase		(  A_  ):
     UpperCAmelCase__    :							Optional[int]									=		"timm_backbone"





     def __init__(self				:   Optional[int]    ,   _A				:   List[str]=None    ,   _A				:   Any=3    ,   _A				:   int=True    ,   _A				:   Union[str, Any]=True    ,   _A				:   Dict=None    ,   **_A				:   Dict    ,   )						->						Any:
         super().__init__(**_A       )
         snake_case								= backbone
         snake_case								= num_channels
         snake_case								= features_only
         snake_case								= use_pretrained_backbone
         snake_case								= True
         snake_case								= out_indices if out_indices is not None else (-1,)



def 						lowercase_      (       A__ = 1000		)							->							int:
    """simple docstring"""

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


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

