import java.util.*;

public class Exercise102{
  public static void main (String[] args){

    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    HashMap<Integer, Boolean> map = new HashMap<Integer, Boolean>();
    for(int i = 0; i < n; i++){
      int x = sc.nextInt();
      if(map.containsKey(x)){
        map.put(x, false);
      }else{
        map.put(x, true);
      }
    }
    int count = 0;
    for(Map.Entry<Integer, Boolean> e:map.entrySet()){
      if(e.getValue()){
        count++;
      }
    }
    System.out.println(count);
  }
}