

import warnings
from functools import wraps
from typing import Callable






def 					__lowercase      (     _A			)     ->						Callable:

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

      return _inner_fn







from math import ceil






def 					__lowercase      (     _A = 1001			)     ->						int:
      SCREAMING_SNAKE_CASE :      Union[str, Any]       =   1

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

      return total


if __name__ == "__main__":
  import sys

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




