#include <bits/stdc++.h>
template <class T>
bool chmin(T& a, const T& b) {
  if (a > b) {
    a = b;
    return 1;
  }
  return 0;
}
template <class T>
bool chmax(T& a, const T& b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}
using namespace std;
using ll = long long;
using P = pair<int, int>;
int main(void) {
  int n;
  cin >> n;
  vector<ll> a(n + 1, 0);
  for (int(i) = 0; (i) < (n); (i)++) cin >> a[i + 1];
  for (int(i) = 1; (i) <= (n); (i++)) a[i] += a[i - 1];
  map<ll, int> mp;
  for (int(i) = 0; (i) < (n + 1); (i)++) mp[a[i]]++;
  ll ans = 0;
  for (auto x : mp) ans += x.second * (x.second - 1) / 2;
  cout << ans << endl;
  return 0;
}
