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.io.PrintWriter;
import java.util.*;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		PrintWriter out = new PrintWriter(System.out);
		int N = Integer.parseInt(sc.next());
		HashSet<Integer> list = new HashSet<>();
		for(int i=0;i<N;i++){
			int ins = Integer.parseInt(sc.next());
			if(list.contains(ins)){
				list.remove(ins);
			}
			else{
				list.add(ins);
			}
		}


		out.println(list.size());
		
		sc.close();
		out.flush();
	}

	public static long gcd(long a, long b){
		long r = a % b;
		if(r==0){
			return b;
		}
		else{
			return gcd(b,r);
		}
	}
}