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.

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