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

		int N = sc.nextInt();
		long[] A = new long[N+1];
		for( int i=0; i<N; i++ ){
			A[i] = sc.nextLong();
		}
		A[N] = 1000000001L;
		Arrays.sort(A);
		int ans = 0;
		int count = 1;
		for( int i=1; i<=N; i++ ){
			if( A[i]==A[i-1] ){
				count++;
			}
			if( A[i]!=A[i-1] || i==N ){
				if( count%2!=0 ){
					ans++;
				}
				count = 1;
			}
		}
		System.out.println(ans);
	}
}
