import java.util.HashMap; import java.util.LinkedList; import java.util.Scanner; public class Main{ public static void main(String args[])throws Exception{ Scanner sc=new Scanner(System.in); int n=Integer.parseInt(sc.nextLine()); HashMap<Integer,Integer>map=new HashMap<Integer,Integer>(); LinkedList<Integer>queue=new LinkedList<Integer>(); for(int i=0;i<n;i++){ int temp=sc.nextInt(); if(!map.containsKey(temp)){ map.put(temp,1); queue.offer(temp); }else{ map.put(temp,map.get(temp)+1); } }int counter=0; for(Integer element:queue){ if(map.get(element) == 1){ counter++; } }System.out.println(counter); } }