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.Arrays;
import java.util.Scanner;

public class Main {

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

	int N = in.nextInt();
	int A[] = new int[N];
	int sum = 0;
	Arrays.fill(A, -1);

	for(int cnt = 0; cnt < N; cnt++){
		A[cnt] = in.nextInt();
	}
	Arrays.sort(A);
	for(int cnt = 0; cnt < N - 1 ; cnt++){
		if(A[cnt] == A[cnt + 1]){
			A[cnt] = 0;
			A[cnt + 1] = 0;
		}
	}
	for(int cnt = 0; cnt < N; cnt++){
		if(A[cnt] == 0){
			sum++;
		}
	}
	in.close();
	System.out.println(N - sum);
	}
}