#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
int n;
int cnt[1 << 20];
int cnt2[1 << 20];
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0), cout.tie(0);
  cin >> n;
  ll res = 0;
  ++cnt2[0];
  for (int pref = 0, a, i = 1; i <= n; ++i) {
    cin >> a;
    pref ^= a;
    if (i & 1) {
      res += cnt[pref];
      ++cnt[pref];
    } else {
      res += cnt2[pref];
      ++cnt2[pref];
    }
  }
  cout << res << endl;
  return 0;
}
