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: Runtime Error)

#include<stdio.h>
#include<stdlib.h>

typedef long long ll;

int max(int a, int b){
  if(a > b) return a;
  else return b;
}
int min(int a, int b){
  if(a < b) return a;
  else return b;
}
int main(){

  int a[100001] = {0};
  int b[10001] = {0};

  int n;
  scanf("%d",&n);

  int tmp;
  for(int i = 0; i < n; ++i){
    scanf("%d",&tmp);
    if(tmp <= 100000 && a[tmp] == 0) a[tmp] = 1;
    else if(tmp <= 100000 && a[tmp] == 1) a[tmp] = 0;
    else if(tmp > 100000 && b[tmp%100000] == 0) b[tmp] = 1;
    else if(tmp > 100000 && b[tmp%100000] == 1) b[tmp] = 0;
  }


  int count = 0;
  for(int i = 0; i < 100001; ++i){
    if(a[i] == 1) count ++;
    if(i<10001){
      if(b[i] == 1) count ++;
    }
  }

  printf("%d",count);

  return 0;

}