(defn t4
  [n]
  (if (= "22" n)
    "Christmas Eve Eve Eve"
    "")
)


(defn t3
  [n]
  (if (= "23" n)
    "Christmas Eve Eve"
    (t4 n))
)


(defn t2
  [n]
  (if (= "24" n)
    "Christmas Eve"
    (t3 n))
)

(defn t
  [n]
  (if (= "25" n)
    "Christmas"
    (t2 n))
)






(def line (read-line))
(print (str "" (t line)))