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++14 (GCC 5.4.1) (judge verdict: Runtime Error)

#include <iostream>
#include <algorithm>
#include <string>
#include <cmath>
#include <map>
#include <vector>

#define REP(i,n) for(int i=0;i<(int)n;i++)
#define REP1(j,n) for(int j=0;j<(int)n;j++)
#define REPD(i,n) for(int i=n;i>=0;i--)
#define REPD1(j,n) for(int j=n;j=>0;j--)
#define REPS(i,n) for(int i=1;i<=(int)n;i++)
#define REPS1(j,n) for(int j=1;j<=(int)n;j++)
#define rep(i,a,n) for(int i=a;i<=(int)n;i++)
#define SZ(x) ((int)(x).size())	//size() unsigned -> int
#define DescSort(a) sort(a.begin(),a.end(),std::greater<int>())

using namespace std;
typedef long long ll;

int main(void) {
	int n,a,ans=0;
	int num[100001] = { 0 };
	cin >> n;
	REP(i, n) {
		cin >> a;
		num[a]++;
	}
	REP(i, n) {
		if (num[i] % 2 != 0) {
			ans++;
		}
	}
	cout << ans << endl;
	return 0;
}