output_description: Print the specified string (case-sensitive).
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      D
attempt: nx = input()
  nx = nx.split()
  n = int(nx[0])
  x = int(nx[1])
  burgers = [None] * 51
  burgers[0] = "P"
  burgers[1] = "BPPPB"
  burgers[2] = "BBPPPBPBPPPBB"
  i = 3
  while i <= n:
      burgers[i] = "B" + burgers[i - 1] + "P" + burgers[i - 1] + "B"
      i += 1
  result = burgers[n][: x - 1]
  print(result.count("P"))
  
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."}]