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: Time Limit Exceeded)

#include <iostream>
using namespace std;
int main()
{
    //string s[100000];
    int n;
    cin >> n;
    string a;
    string s[n];
    int count=0;
    for(int i=0;i<n;i++)
    {
        //cout << "for roop1\n";
        if(i==0)
        {
            cin >> a;
            s[i] = a;
        }
        else
        {
            cin >> a;
            s[i]=a;
            for(int j=0;j<i;j++){
                //cout << "for roop2\n";
                if(s[j]==a){
                    s[j]=' ';
                    s[i]=' ';
                    count -=2;
                    break;
                }
            }
        }
        count++;
        //cout << "now = " <<count << "\n";
    
    }
    cout << count << "\n";
    return 0;
}