input: def dict_sum(dict):
      sum = 0
      for key, value in dict.items():
          sum += value
      return sum
  
  """
  Compute the sum of the values of a given dictionary.
  
  >>> dict_sum({'A':5, 'B':6, 'C':10})
  21
  """
output:     sum = 0
      for key, value in dict.items():
          sum += value
      return sum