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.

Examples

Input

3
6
2
6

Output

1

Input

4
2
5
5
2

Output

0

Input

6
12
22
16
22
18
12

Output

2

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