input: from typing import List
  
  def find_max_of_three(a: float, b: float, c: float) -> float:
      """ Find the maximum of three numbers.
      >>> find_max_of_three(3, 4, 5)
      5
      >>> find_max_of_three(10, 10, 9)
      10
      """
output:     if a >= b and a >= c:
          return a
      elif b >= a and b >= c:
          return b
      else:
          return c