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.Scanner;
import static java.lang.System.out;
import java.util.Arrays;
public class Main{
   public static void main(String []args){
      Scanner sc = new Scanner(System.in);
      int N = sc.nextInt();
      boolean flag = true;
      int count = 0;
      int array[] = new int[N];  
      for(int i=0; i<N;i++){
         array[i] = sc.nextInt();

      }
      Arrays.sort(array);

      for(int i=0;i<N; i++){
         if(i ==N-1){
            ++count;
            break;
         }
         if(array[i] == array[i+1]){
            i +=1;
         }else{
            ++count;
         }
      }  out.println(count);
      }
      
   }