#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define plx pair<ll,int>
#define f first
#define s second
#define pb push_back
#define all(x) x.begin(),x.end()
#define vi vector<int>
#define vvi vector<vi>
#define pp pair<ll,int>
#define ub(x,i) upper_bound(all(x),i)-x.begin()
#define lb(x,i) lower_bound(all(x),i)-x.begin()
#define t3 tuple<int,int,int>
using namespace std;
const int mxn=5e5+5;
int main(){
ios_base::sync_with_stdio(0);cin.tie(0);
int n;cin>>n;
ll v[n];ll rs=0;
for(int i=0;i<n;i++)cin>>v[i];
ll x=1;
for(int p=1;p<32;p++){
x*=2;
vector<ll>md;
for(int i=0;i<n;i++)md.pb((v[i]%x+x)%x);
sort(all(md));ll cnt=0;
ll l=x>>1,r=x-1;
for(int i=0;i<n;i++){
ll tl=((l-v[i])%x+x)%x,tr=((r-v[i])%x+x)%x;
if(tl<=tr)cnt+=upper_bound(all(md),tr)-lower_bound(all(md),tl);
else {
cnt+=upper_bound(all(md),2e12)-lower_bound(all(md),tl);
cnt+=upper_bound(all(md),tr)-lower_bound(all(md),0);
}
}if(cnt%2==1)rs+=x/2;
}cout<<rs;
}
