#include <bits/stdc++.h>
using namespace std;
#define ll long long int
#define sep ios::sync_with_stdio(0),cin.tie(0)
const ll MXi = 1e5 + 5;
int main() {
    sep;
    ll n, su = 0, tmp = 0, x; cin >> n;
    ll res = n*(n+1)/2;
    unordered_map<ll, ll> seen;
    seen[0] = 1;
    for (ll i = 0; i < n; ++i) {
        cin >> x;
        su+= x;
        ++seen[su];
    }
    for (auto X: seen)
        res-= (X.second*(X.second-1)/2);
    cout << res << "\n";
    return 0;
}

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