func main()
	var n: int :: cui@inputInt()
	var dic: dict<int, int> :: #dict<int, int>
	var ans: int :: 0
	for i(0, n - 1)
		var ai: int :: cui@inputInt()
		var cnt: int :: 1
		if(dic.exist(ai))
			do cnt :: dic.get(ai, &) + 1
		end if
		if(cnt = 1)
			do ans :+ 1
		elif(cnt = 2)
			do ans :- 1
		end if
		do dic.add(ai, cnt)
	end for
	do cui@print("\{ans}\n")
end func