



"""simple docstring"""






import os
from distutils.util import strtobool






def   snake_case__     (	__lowerCamelCase       :					Any							,	__lowerCamelCase       :					Optional[int]			):
			"""simple docstring"""


			for e in env_keys:
						lowerCamelCase__	:	Any				=int(os.environ.get(lowerCAmelCase_							,	-1			)			)
						if val >= 0:
									return val
			return default






def   snake_case__     (	__lowerCamelCase       :					Dict							,	__lowerCamelCase       :					Union[str, Any]=False			):
			"""simple docstring"""
			lowerCamelCase__	:	List[str]				=os.environ.get(lowerCAmelCase_							,	str(lowerCAmelCase_			)			)
			return strtobool(lowerCAmelCase_			) == 1  # As its name indicates `strtobool` actually returns an int...






def   snake_case__     (	__lowerCamelCase       :					Union[str, Any]							,	__lowerCamelCase       :					Optional[Any]="no"			):
			"""simple docstring"""
			lowerCamelCase__	:	Optional[Any]				=os.environ.get(lowerCAmelCase_							,	str(lowerCAmelCase_			)			)
			return value









"""simple docstring"""






from __future__ import annotations

from collections.abc import Iterator

class  __SCREAMING_SNAKE_CASE			:


					'''simple docstring'''





					def __init__( self							:						str,						lowerCamelCase							:						int  )->      None:
								lowerCamelCase__	:	str				=value
								lowerCamelCase__	:	Node | None				=None
								lowerCamelCase__	:	Node | None				=None





class  __SCREAMING_SNAKE_CASE			:


					'''simple docstring'''





					def __init__( self							:						int,						lowerCamelCase							:						Node  )->      None:
								lowerCamelCase__	:	Any				=tree



					def 	snake_case ( self							:						str,						lowerCamelCase							:						Node | None  )->      int:
								if node is None:
											return 0
								return node.value + (
								    self.depth_first_search(node.left  ) + self.depth_first_search(node.right  )
								)




					def __iter__( self							:						Dict  )->      Iterator[int]:
								yield self.depth_first_search(self.tree  )


if __name__ == "__main__":
		import doctest

		doctest.testmod()




