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 JavaScript (Node.js 12.16.1) (judge verdict: Accepted)

'use strict';

const main = arg => {

    const input = arg.split("\n");
    const n = parseInt(input[0]);

    let freq = new Map();
    for (let i = 0; i < n; i++) {
        const a = parseInt(input[i + 1].trim());
        if (freq.has(a)) {
            freq.set(a, freq.get(a) + 1);
        } else {
            freq.set(a, 1);
        }
    }

    let count = 0;
    for (const [key, value] of freq.entries()) {
        if (value % 2 == 1) {
            count++;
        }
    }
    console.log(count);
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'));