Problem:
Score : 300 points

Problem Statement

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.

Sample Input 1

3
6
2
6

Sample Output 1

1

The game proceeds as follows:

6 is not written on the sheet, so write 6.

2 is not written on the sheet, so write 2.

6 is written on the sheet, so erase 6.

Thus, the sheet contains only 2 in the end. The answer is 1.

Sample Input 2

4
2
5
5
2

Sample Output 2

0

It is possible that no number is written on the sheet in the end.

Sample Input 3

6
12
22
16
22
18
12

Sample Output 3

2

Solution in C (GCC 5.4.1) (judge verdict: Time Limit Exceeded)

    #include <stdio.h>
    #include <stdlib.h>
     
    int main() {
      
      int i, j;
      int totalNum = 0;
      int number = 0;
      int count = 0;
      
      scanf("%d", &totalNum);
      
      int *numberLen[totalNum];
      
      for(i = 0; i < totalNum; i++) {
        numberLen[i] = (int *)malloc(sizeof(int));
        scanf("%d", &numberLen[i]);
        
        for(j = 0; j < i; j++) {
          if(i != j && numberLen[j] == numberLen[i]) {
            numberLen[j] = 0;
            numberLen[i] = 0;
          }
        }
        
       }
       
       for(i = 0; i < totalNum; i++) {
         if(numberLen[i] != 0) {
           count++;
         }
       }
      
      printf("%d", count);
      
      return 0;
    }