{"raw_statement":[{"iden":"problem statement","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 sheet; if not, write the number on the sheet. This process is repeated $N$ times.\n*   Then, you are asked a question: How many numbers are written on the sheet now?\n\nThe 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?"},{"iden":"constraints","content":"*   $1≤N≤100000$\n*   $1≤A_i≤1000000000(=10^9)$\n*   All input values are integers."},{"iden":"input","content":"Input is given from Standard Input in the following format:\n\n$N$\n$A_1$\n$:$\n$A_N$"},{"iden":"sample input 1","content":"3\n6\n2\n6"},{"iden":"sample output 1","content":"1\n\nThe game proceeds as follows:\n\n*   $6$ is not written on the sheet, so write $6$.\n    \n*   $2$ is not written on the sheet, so write $2$.\n    \n*   $6$ is written on the sheet, so erase $6$.\n    \n\nThus, the sheet contains only $2$ in the end. The answer is $1$."},{"iden":"sample input 2","content":"4\n2\n5\n5\n2"},{"iden":"sample output 2","content":"0\n\nIt is possible that no number is written on the sheet in the end."},{"iden":"sample input 3","content":"6\n12\n22\n16\n22\n18\n12"},{"iden":"sample output 3","content":"2"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}