input:  
  def get_max_value(numbers): 
      """ Prints the largest value from a given list of numbers.
      >>> get_max_value([2, 4, 1, 6])
      6
      >>> get_max_value([10, 20, -5, 15])
      20
      """
      return max(numbers)
  
output:     print(get_max_value(numbers))