You are playing the following game with Joisino.

* Initially, you have a blank sheet of paper.
* Joisino announces a number. If that number is written on the sheet, erase the number from the sheet; if not, write the number on the sheet. This process is repeated N times.
* Then, you are asked a question: How many numbers are written on the sheet now?



The numbers announced by Joisino are given as A_1, ... ,A_N in the order she announces them. How many numbers will be written on the sheet at the end of the game?

Constraints

* 1≤N≤100000
* 1≤A_i≤1000000000(=10^9)
* All input values are integers.

Input

Input is given from Standard Input in the following format:


N
A_1
:
A_N


Output

Print how many numbers will be written on the sheet at the end of the game.

Examples

Input

3
6
2
6


Output

1


Input

4
2
5
5
2


Output

0


Input

6
12
22
16
22
18
12


Output

2
import java.util.*;
import java.awt.*;
import static java.lang.System.*;
import static java.lang.Math.*;
public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(in);
        int n=sc.nextInt();
        int ans=0;
        HashMap<Integer,Integer> m=new HashMap<>();
        for (int i = 0; i < n; i++) {
            int c=sc.nextInt();
            m.put(c, 1+m.getOrDefault(c, 0));
        }
        for(int k:m.keySet()){
            if(m.get(k)%2==1)ans++;
        }
        out.println(ans);
    }
}