"""simple docstring"""
from __future__ import annotations







def 		__a  (      _SCREAMING_SNAKE_CASE  )      ->bool:
  a__:	int
  a__:	list[str]     				=      list(_SCREAMING_SNAKE_CASE  )
  a__				,       a__:	Optional[int]     				=      _vector[:-1], int(_vector[-1]  )
  a__:	list[int]     				=      [int(_SCREAMING_SNAKE_CASE  ) for digit in __vector]

  vector.reverse()
  for i, digit in enumerate(_SCREAMING_SNAKE_CASE  ):
    if i & 1 == 0:
      a__:	int     				=      digit * 2
      if doubled > 9:
        doubled -= 9
      check_digit += doubled
    else:
      check_digit += digit

  return check_digit % 10 == 0


if __name__ == "__main__":
 import doctest

 doctest.testmod()
 assert is_luhn('79927398713')
 assert not is_luhn('79927398714')



"""simple docstring"""
from __future__ import annotations

import sys







def 		__a  (      _SCREAMING_SNAKE_CASE  )      ->int:
  if n < 0:
    raise ValueError('Negative arguments are not supported'  )
  return _fib(_SCREAMING_SNAKE_CASE  )[0]







def 		__a  (      _SCREAMING_SNAKE_CASE  )      ->tuple[int, int]:
  if n == 0:  # (F(0), F(1))
    return (0, 1)

  # F(2n) = F(n)[2F(n+1) − F(n)]
  # F(2n+1) = F(n+1)^2+F(n)^2
  a__				,       a__:	Optional[int]     				=      _fib(n // 2  )
  a__:	List[str]     				=      a * (b * 2 - a)
  a__:	Dict     				=      a * a + b * b
  return (d, c + d) if n % 2 else (c, d)


if __name__ == "__main__":
 lowercase__   			=      int(sys.argv[1])
 print(f"fibonacci({n}) is {fibonacci(n)}")


