

import warnings
from functools import wraps
from typing import Callable







def 			A_      (    _UpperCAmelCase    ):

						@wraps(_UpperCAmelCase    )
						def _inner_fn(*_UpperCAmelCase				,	**_UpperCAmelCase    ):
												warnings.warn(
												    (f"'{fn.__name__}' is experimental and might be subject to breaking changes in the future.")				,	_UpperCAmelCase				,	)
												return fn(*_UpperCAmelCase				,	**_UpperCAmelCase    )

						return _inner_fn









from math import ceil



def    __UpperCAmelCase (	__a      :			int = 1_001	)			->     int:

					"""simple docstring"""

					_a	:    List[Any]         =		1

					for i in range(1		,int(ceil(n / 2.0	)	)	):
										_a	:    Optional[Any]         =		2 * i + 1
										_a	:    Optional[int]         =		2 * i
										_a	:    str         =		total + 4 * odd**2 - 6 * even

					return total


if __name__ == "__main__":
			import sys

			if len(sys.argv) == 1:
						print(solution())
			else:
						try:
									a__				=		int(sys.argv[1])
									print(solution(n))
						except ValueError:
									print('''Invalid entry - please enter a number''')



