input: 
  from typing import Dict, Any
  
  def findMaxValue(nested_dict: Dict[str, Any]) -> int:
      """ Find the maximum value within a nested dictionary.
      >>> findMaxValue({"key1": {"value1": 10, "value2": 20}, "key2": {"value3": 40}})
      40
      >>> findMaxValue({"levels": {"level1": {"level2": 5, "another2": 15}}, "another": 30})
      30
      """
      max_val = None
      for key, value in nested_dict.items():
          if isinstance(value, dict):
              max_val = max(findMaxValue(value), max_val)
          else:
              max_val = max(value, max_val)
      return max_val
  
  print(findMaxValue(sample_dict))
  
output:     
      if max_val is None:
          max_val = float('-inf')
      return max_val
  