#include <iostream>
#include <vector>
#include <unordered_map>
using namespace std;

int main() {
    int n;
    cin >> n;

    vector<int> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }

    unordered_map<int, int> prefix_xor_count;
    prefix_xor_count[0] = 1;

    int xor_sum = 0;
    int ans = 0;
    for (int i = 0; i < n; i++) {
        xor_sum ^= a[i];
        ans += prefix_xor_count[xor_sum];
        prefix_xor_count[xor_sum]++;
    }

    cout << ans << endl;

    return 0;
}