object Main extends App {
    var l: String = readLine
    var line = l.toInt

      if(line == 25) {
    println("Christmas")
    } 
  if(line == 24) {
    println("Christmas Eve")
    }
  if(line == 23) {
    println("Christmas Eve Eve")
    }
  if(line == 22) {
    println("Christmas Eve Eve Eve")
    }
        	 
  
  
}
