input: Write a function to find the maximum of three numbers. The function should take three parameters a, b, and c and return the largest of the three numbers.
  
  ### Input:
  3, 4, 5
  
  ### Output:
  def max_of_three(a, b, c):
      if a > b and a > c:
          return a
      elif b > a and b > c:
          return b
      else:
          return c
  
  result = max_of_three(3, 4, 5)
  print(result) == 5
output: def max_of_three(a, b, c):
      if a > b and a > c:
          return a
      elif b > a and b > c:
          return b
      else:
          return c