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