#include<bits/stdc++.h>

#pragma GCC optimize("O3")
#pragma GCC target("avx2")

using namespace std;

#define int long long
#define aint(x) (x).begin(), (x).end()
typedef long long ll;
typedef long double ld;

const int one = 1;
const int INF = 1e18;
const int MOD = 1e9 + 7;
const int N = 2e5;
const int nul = 0;

signed main() {
#ifdef parasha
    freopen("A.in", "r", stdin);
#endif // parasha
    int n;
    cin >> n;
    vector<int> smth(n);
    for (int &i : smth) cin >> i;
    int pref[n+1] = {0};
    for (int i = 1; i <= n; i++) {
        pref[i] = pref[i-1] + smth[i-1];
    }
    map<int,int> gadost;
    gadost[0] = 1;
    int p = 0;
    int ans = 0;
    for (int i = 1; i <= n; i++) {

        ans += i - max(gadost[pref[i]], p);

        if(gadost[pref[i]]) {
            p = max(p, gadost[pref[i]]);
        }
        if(!smth[i - 1]) {
            p = i;
        }
        gadost[pref[i]] = i+1;
    }
    cout << ans << endl;
}