Write and Erase

AtCoder

IDabc073_c

Time2000ms

Memory256MB

Difficulty—

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: $N$ $A_1$ $:$ $A_N$ [samples]

Samples

Input #1

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 $1$.

Input #2

Output #2

0

It is possible that no number is written on the sheet in the end.

Input #3

Output #3

API Response (JSON)

{
  "problem": {
    "name": "Write and Erase",
    "description": {
      "content": "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 shee",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc073_c"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "You are playing the following game with Joisino.\n\n*   Initially, you have a blank sheet of paper.\n*   Joisino announces a number. If that number is written on the sheet, erase the number from the shee...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments