#!/usr/bin/env python3
#fileencoding: utf-8

N = int(input())
dic = {}
for i in input().strip().split(" "):
    if i in dic:
        dic[i] = False
    else:
        dic[i] = True
count = 0
for k,v in dic.items():
    if v == True:
        count += 1
print(count)