#include <bits/stdc++.h>
using namespace std;
using ll = long long;
constexpr ll atcoder_mod = 1e9 + 7;
template <typename T = int>
T in() {
  T x;
  cin >> x;
  return (x);
}
template <typename T = int, typename C = vector<T>>
C vecin(int N) {
  C x(N);
  for (int i = 0; i < (N); ++i) {
    x[i] = in<T>();
  }
  return move(x);
}
void vout() { cout << endl; }
template <typename Head, typename... Tail>
void vout(Head&& h, Tail&&... t) {
  cout << ' ' << h;
  vout(forward<Tail>(t)...);
}
void out() { cout << endl; }
template <typename Head, typename... Tail>
void out(Head&& h, Tail&&... t) {
  cout << h;
  vout(forward<Tail>(t)...);
}
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(10);
  int N = in();
  vector<ll> S(N + 1, 0);
  for (int i = 0; i < (N); ++i) {
    ll V = in();
    S[i + 1] += S[i] + V;
  }
  map<int, int> C;
  for (int i = 0; i < (N + 1); ++i) {
    C[S[i]]++;
  }
  ll sum = 0;
  for (auto& x : C) {
    sum += max(0LL, x.second * (x.second - 1LL) / 2LL);
  }
  out(sum);
  return 0;
}
