#include <bits/stdc++.h>
#define fi first
#define se second
#define sz(v) (int)(v).size()
using namespace std;
const int MXn = 1000005;
const long long oo = 1e18;
const int MOD = 1e9 + 7;
int N;
int a[MXn];
int t[MXn];
signed main(void) {
ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
cin >> N;
for (int i = 1; i <= N; i++) cin >> a[i];
int mask = 0;
int ans = 0;
vector<int> v[2];
v[0].resize(N);
iota(begin(v[0]), end(v[0]), 1);
for (int k = 0; k < 30; k++) {
mask |= (1 << k);
int num = 0;
vector<int> tmp[2];
for (int id: v[0]) tmp[(a[id] >> k) & 1].emplace_back(id);
for (int id: v[1]) tmp[(a[id] >> k) & 1].emplace_back(id);
v[0] = tmp[0];
v[1] = tmp[1];
for (int id: v[0]) t[++num] = (a[id] & mask);
for (int id: v[1]) t[++num] = (a[id] & mask);
int p1 = N, p2 = N, p3 = N;
int cnt = 0;
for (int i = 1; i <= N; i++) {
while (t[i] + t[p1] >= (1 << k) && p1 >= i) p1--;
while (t[i] + t[p2] >= (1 << (k + 1)) && p2 >= i) p2--;
while (t[i] + t[p3] >= ((1 << (k + 1)) + (1 << k)) && p3 >= i) p3--;
cnt += (max(p2, i - 1) - max(p1, i - 1)) + (N - max(i, p3 + 1) + 1);
cnt &= 1;
}
ans += (cnt << k);
}
cout << ans;
return 0;
}
