import scala.collection.mutable import scala.io.StdIn.readLine object Main { def main(args:Array[String]) = { val n = readLine().toInt val a = readLine().split(" ").map(_.toInt).sorted val m = mutable.Map.empty[Int,Int] a.foreach((k) => m += k -> (1 + m.getOrElse(k,0))) val ans = a.count((k) => m(k) == 1) println(ans) } }