output_description: Print the specified string (case-sensitive).
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      D
attempt: pb_list = []
  p_count = 0
  
  
  def pb(n):
      if n == 0:
          pb_list.append("p")
          p_count = p_count + 1
          return
      elif n >= 0:
          pb_list.append("b")
          pb(n - 1)
          pb_list.append("p")
          p_count = p_count + 1
          pb(n - 1)
          pb_list.append("b")
      else:
          return
  
  
  n, x = input().split(" ")
  n = int(n)
  x = int(x)
  pb(n)
  
  # for i in range(x):
  #    if pb_list[i] == 'p':
  #        p_count = p_count + 1
  
  print(p_count)
  
problem_description: Statement
  
  In some other world, today is December D-th.
  
  Write a program that prints `Christmas` if D = 25, `Christmas Eve` if D = 24,
  `Christmas Eve Eve` if D = 23 and `Christmas Eve Eve Eve` if D = 22.
samples: [{"input": "25", "output": "Christmas\n    \n\n* * *"}, {"input": "22", "output": "Christmas Eve Eve Eve\n    \n\nBe sure to print spaces between the words."}]