code: 
  
  from __future__ import annotations
  
  import sys
  
  
  
  
  
  
  def 		_A		(		_lowercase   )				->   int:
  
  
       """simple docstring"""
  
  
       if n < 0:
            raise ValueError('Negative arguments are not supported'   )
       return _fib(_lowercase   )[0]
  
  
  
  
  
  
  def 		_A		(		_lowercase   )				->   tuple[int, int]:
  
  
       """simple docstring"""
  
  
       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
       __UpperCamelCase,						__UpperCamelCase   = _fib(n // 2   )
       __UpperCamelCase   = a * (b * 2 - a)
       __UpperCamelCase   = a * a + b * b
       return (d, c + d) if n % 2 else (c, d)
  
  
  if __name__ == "__main__":
      __snake_case             =	int(sys.argv[1])
      print(f"""fibonacci({n}) is {fibonacci(n)}""")
  
  
  
style_context: 
  
  
  def 		_A		(		_lowercase   )				->   bool:
  
  
       """simple docstring"""
  
  
       if not isinstance(_lowercase				,     _lowercase   ):
            raise ValueError('Input series is not valid, valid series - [1, 2/3, 2]'   )
       if len(_lowercase   ) == 0:
            raise ValueError('Input list must be a non empty list'   )
       if len(_lowercase   ) == 1 and series[0] != 0:
            return True
       __UpperCamelCase   = []
       __UpperCamelCase   = len(_lowercase   )
       for i in range(0				,     _lowercase   ):
            if series[i] == 0:
                 raise ValueError('Input series cannot have 0 as an element'   )
            rec_series.append(1 / series[i]   )
       __UpperCamelCase   = rec_series[1] - rec_series[0]
       for index in range(2				,     _lowercase   ):
            if rec_series[index] - rec_series[index - 1] != common_diff:
                 return False
       return True
  
  
  
  
  
  
  def 		_A		(		_lowercase   )				->   float:
  
  
       """simple docstring"""
  
  
       if not isinstance(_lowercase				,     _lowercase   ):
            raise ValueError('Input series is not valid, valid series - [2, 4, 6]'   )
       if len(_lowercase   ) == 0:
            raise ValueError('Input list must be a non empty list'   )
       __UpperCamelCase   = 0
       for val in series:
            answer += 1 / val
       return len(_lowercase   ) / answer
  
  
  if __name__ == "__main__":
      import doctest
  
      doctest.testmod()
  
  
  