object Main extends App {
  val sc = new java.util.Scanner(System.in)
//  val l = List.fill(5)(sc.nextInt)
  val d = sc.nextInt

  val ans =
    if (d == 25) "Christmas"
    else if (d == 24) "Christmas Eve"
    else if (d == 23) "Christmas Eve Eve"
    else if (d == 22) "Christmas Eve Eve Eve"

  println(ans)
}