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 Rust (1.15.1) (judge verdict: Accepted)

use std::collections::HashMap;

fn read<T: std::str::FromStr>()->T{
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();

    s.trim().parse().ok().unwrap()
}


fn main(){
    
    let s: String = read();
    
    let n:i64 = s.parse().unwrap();

    let mut vec: Vec<i64> = Vec::new();

    
    let mut mp:HashMap<i64, i64> = HashMap::new();

    for i in 0..n{
        let tmp: String = read();
        let num: i64 = tmp.parse().ok().unwrap();
        
        let c = mp.entry(num).or_insert(0);
        *c += 1;
    }

  

    println!("{}", mp.iter().filter(|&(k, v)| *v%2==1).count());

}