include <bits/stdc++.h>

using namespace std;

int main() { int n; cin >> n; vector<int> a(n); for (int &x : a) cin >> x;

long long ans = 0;
int r = 0;
long long sum = 0, xsum = 0;

for (int l = 0; l < n; ++l) {
    while (r < n && (sum + a[r]) == (xsum ^ a[r])) {
        sum += a[r];
        xsum ^= a[r];
        ++r;
    }

    ans += r - l;

    sum -= a[l];
    xsum ^= a[l];
}

cout << ans << '\n';
return 0;

}