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
public class Main {
	public static void main(String[] args) {
	    java.util.Scanner scanner = new java.util.Scanner(System.in);
	    int n = scanner.nextInt();
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = scanner.nextInt();
		}
		java.util.Arrays.sort(a);
		int count = 0;
		int same = 0;
		int i = 0;
		for (i = 0; i < n - 1; i++) {
			if (a[i] == a[i + 1]) {	// 同じならセットで読み飛ばす
				i++;
			} else {
				count++;
			}
		}
		if ( i == (n - 1)) {
			count++;
		}
		System.out.println(count);

	}
}