require 'set'
#set1.include?
n=STDIN.gets.to_i
as=STDIN.gets.split(" ")

set1=Set.new()
set2=Set.new()

as.each do |e|
	if set2.include?(e)
		next
	end
	if set1.include?(e)
		set1.delete(e)
		set2.add(e)
	else
		set1.add(e)
	end
end
puts set1.size