
import java.util.Scanner

object Main extends App {
  val sc = new Scanner(System.in)
  def next(): String = sc.next()
  def nextInt(): Int = next().toInt
  def nextLong(): Long = next().toLong

  def task(): Unit = {
    val d = nextInt()
    val ans = (Seq("Christmas") ++ Seq.fill(25 - d)("Eve")).mkString(" ")
    println(ans)
  }

  task()
}
