#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;
const long double pi = acos(-1.0);
const int day[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
const int digarr[10] = {6, 2, 5, 5, 4, 5, 6, 3, 7, 6};
const int dx[4] = {-1, 0, 1, 0};
const int dy[4] = {0, 1, 0, -1};
const int dxo[8] = {-1, -1, -1, 0, 1, 1, 1, 0};
const int dyo[8] = {-1, 0, 1, 1, 1, 0, -1, -1};
const int alf = 26;
const int dig = 10;
const int two = 2;
const int th = 3;
const long long prost = 239;
const long long bt = 31;
const long double eps = 1e-8;
const long long INF = 1e18 + 239;
const int BIG = 1e9 + 239;
const int MOD = 998244353;
const long long MOD2 = (long long)MOD * (long long)MOD;
mt19937_64 rnd(239);
const int M = 3e5 + 239;
const int N = 2e3 + 239;
const int L = 20;
const int T = (1 << 20);
const int B = trunc(sqrt(M)) + 1;
const int X = 1e4 + 239;
int n, a[M], p[M];
map<int, int> kol;
int32_t main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  cin >> n;
  for (int i = 0; i < n; i++) cin >> a[i];
  p[0] = 0;
  for (int i = 0; i < n; i++) p[i + 1] = p[i] ^ a[i];
  for (int i = 0; i <= n; i++) p[i] = (p[i] * 2 + (i % 2));
  long long ans = 0;
  for (int i = 0; i <= n; i++) {
    ans += kol[p[i]];
    kol[p[i]]++;
  }
  cout << ans;
  return 0;
}
