code: 
  '''simple docstring'''
  
  
  
  from __future__ import annotations
  
  
  
  
  
  class 			A							:
  
  
  
  			def __init__(					self       ,     lowerCamelCase__ = 0       )			->		None:
  
  
  
  
  									'''simple docstring'''
  
  
  
  									lowercase__							 =       value
  									lowercase__							 =       None
  									lowercase__							 =       None
  
  
  
  
  
  def  _A		(							lowercase__		,		lowercase__	):
  						if treea is None:
  												return treea
  						if treea is None:
  												return treea
  
  						lowercase__							 =       treea.value + treea.value
  						lowercase__							 =       merge_two_binary_trees(treea.left		,		treea.left	)
  						lowercase__							 =       merge_two_binary_trees(treea.right		,		treea.right	)
  						return treea
  
  
  
  
  
  def  _A		(							lowercase__	):
  						if root:
  												print(root.value	)
  												print_preorder(root.left	)
  												print_preorder(root.right	)
  
  
  if __name__ == "__main__":
  				__A          =    Node(1)
  				__A          =    Node(2)
  				__A          =    Node(3)
  				__A          =    Node(4)
  
  				__A          =    Node(2)
  				__A          =    Node(4)
  				__A          =    Node(6)
  				__A          =    Node(9)
  				__A          =    Node(5)
  
  				print("Tree1 is: ")
  				print_preorder(treea)
  				print("Tree2 is: ")
  				print_preorder(treea)
  				__A          =    merge_two_binary_trees(treea, treea)
  				print("Merged Tree is: ")
  				print_preorder(merged_tree)
style_context: 
  '''simple docstring'''
  
  
  
  def  _A		(							lowercase__	):
  
  						# validate:
  						if not isinstance(lowercase__		,		lowercase__	) or not all(
  						    isinstance(lowercase__		,		lowercase__	) and item >= 0 for item in citations	):
  												raise ValueError("""The citations should be a list of non negative integers."""	)
  
  						citations.sort()
  						lowercase__							 =       len(lowercase__	)
  
  						for i in range(lowercase__	):
  												if citations[len_citations - 1 - i] <= i:
  																		return i
  
  						return len_citations
  
  
  if __name__ == "__main__":
  				import doctest
  
  				doctest.testmod()
  
  
  
  
  
  
  