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.*;

public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n, ans = 0;
		
		n = sc.nextInt();
		int a[] = new int[n];
		for(int i = 0; i < n; ++i) {
			int tmp = sc.nextInt();
			a[i] = tmp;
		}
		
		Arrays.sort(a);
		
		int count = 1;
		
		for(int i = 0; i < n - 1; ++i) {
			if(a[i] == a[i + 1])
				count++;
			else {
				if(count % 2 == 1)ans++;
				count = 1;
			}
		}
		
		if(count % 2 == 1)ans++;
		
		sc.close();
			System.out.println(ans);
	}

}
