input: 
  def max_of_three(a, b, c):
      """Finds the maximum of three given numbers.
      >>> max_of_three(3, 4, 5)
      5
      >>> max_of_three(10, 2, 7)
      10
      >>> max_of_three(1, 1, 1)
      1
      """
      if a > b and a > c:
          return a
      elif b > a and b > c:
          return b
      else:
          return c
  
output:     if a > b and a > c:
          return a
      elif b > a and b > c:
          return b
      else:
          return c