


'''simple docstring'''

import safs







class 			UpperCAmelCase			(							safs.SaFileSystem):
 pass

'''simple docstring'''





def 							snake_case				(		UpperCAmelCase						)->      int:







      """simple docstring"""
      if not isinstance(UpperCAmelCase   ,	UpperCAmelCase						):
            raise ValueError('double_factorial() only accepts integral values'						)
      if num < 0:
            raise ValueError('double_factorial() not defined for negative values'						)
      __A													=      1
      for i in range(UpperCAmelCase   ,	0   ,	-2						):
            value *= i
      return value


if __name__ == "__main__":
 import doctest

 doctest.testmod()






