#include<bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC target("avx2")
#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=1e6+5;
const int x[31]={1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536,131072,262144,524288,1048576,2097152,4194304,8388608,16777216,33554432,67108864,134217728,268435456,536870912,1073741824};
int a[mxn]{0};
int main(){
ios_base::sync_with_stdio(0);cin.tie(0);
int n;cin>>n;
int v[n];int rs=0;
for(int i=0;i<n;i++)cin>>v[i],a[i]=1;
for(int p=30;p>=1;p--){
for(int i=0;i<n;i++)v[i]%=x[p];
sort(v,v+n);ll cnt=0;
int l=x[p]/2,r=x[p]-1;
int tl=((l-v[0])%x[p]+x[p])%x[p];
int tr=((r-v[0])%x[p]+x[p])%x[p];
int del=0,add=0,cl=0,cr=0;
for(int i=0;i<n;i++){
a[i]=1;
if(v[i]<tl)del+=a[i],cl=i;
if(v[i]<=tr)add+=a[i],cr=i;
}
for(int i=0;i<n;i++){
if(tl<=tr)cnt+=add-del;
else cnt+=(n-i)+add-del;
if(i==n-1)continue;
a[i]=0;if(cl>=i)del--;if(cr>=i)add--;
tl = l-v[i+1];tr = r-v[i+1];
if(tl>=0)while(v[cl]>=tl)del-=a[cl],cl--;
else {
tl +=x[p];tl%=x[p];del=0,cl=0;
for(int j=0;j<n;j++)if(v[j]<tl)del+=a[j],cl=j;
}
if(tr>=0)while(v[cr]>tr)add-=a[cr],cr--;
else {
tr +=x[p];tr%=x[p];add=0,cr=0;
for(int j=0;j<n;j++)if(v[j]<=tr)add+=a[j],cr=j;
}
}
if(cnt%2==1)rs+=x[p-1];
}cout<<rs;
}
