#include <iostream>
#include <iterator>
#include <algorithm>
#include<set>
int main(){
  std::cout.sync_with_stdio(false);
    
//  std::vector<int> vc;
  size_t N;
  std::cin >> N;
//  vc.reserve(N);
  int temp;
  std::cin>>temp;
  
  std::multiset<int> vc;//{temp};
  vc.insert(temp);
  size_t cnt{1};
  for(size_t s{0}; s<N-1;s++){
    std::cin>>temp;
    //size_t&& a = count(std::begin(vc),std::end(vc),temp);
    size_t&& a = vc.count(temp);
  //  std::cout<<a<<"<-a\n";
    if(0 == a){    
        vc.insert(temp);  
        cnt++;
    }
    if(1 == a){
        vc.insert(temp);
        cnt--;
    }
  }/*
  for(const auto& v:vc){
    std::cout<<v<<" ";
  }*/
 // std::cout<<"size:"<<vc.size()<<"\n";
  std::cout<<cnt<<std::endl;
}