#include<iostream>
#include<vector>
#include<algorithm>
#include<set>
#include<map>
#include<queue>
#include<string>
#include<math.h>
using namespace std;
using ll = long long;
using vll = vector<ll>;
using vvll = vector<vll>;
using pll = pair<ll, ll>;
using vpll = vector<pair<ll, ll>>;
using vvpll = vector<vpll>;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
ll n;
cin >> n;
vll arr(n);
for (ll i = 0; i < n; i++) cin >> arr[i];
ll ans = 0;
for (ll b = 0; b < 30; b++) {
ll res = 0;
ll carry = (ll)1 << b;
for (ll i = 0; i < n; i++) {
if (((arr[i] * 2) >> b) & 1) { res++; }
}
ans += (res % 2) * carry;
}
cout << ans << endl;
}
