input: Write a function to compute the sum of the values of a given dictionary. The function should take a dictionary as input and return the sum of all its values.
  
  def dict_sum(dictionary):
      sum = 0
      for value in dictionary.values():
          sum += value
      return sum
  
  assert dict_sum({'A': 5, 'B': 6, 'C': 10}) == 21
  assert dict_sum({'X': 1, 'Y': 2, 'Z': 3}) == 6
  assert dict_sum({}) == 0
output: def dict_sum(dictionary):
      sum = 0
      for value in dictionary.values():
          sum += value
      return sum