fun main (args : Array<String>) {
	val d = readLine()
	val D : Int = d!!.toInt()
	return if (D == 25) {
		println("Christmas")
	} else if (D == 24) {
		println("Christmas Eve")
	} else if (D == 23) {
		println("Christmas Eve Eve")
	} else {
		println("Christmas Eve Eve Eve")
	}
}