#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  vector<int> a(n + 1);
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  map<int, int> m;
  m[0]++;
  for (int i = 1; i <= n; i++) {
    a[i] += a[i - 1];
    m[a[i]]++;
  }
  int ans = 0;
  for (auto& e : m) {
    ans += e.second * (e.second - 1) / 2;
  }
  cout << ans << endl;
  return 0;
}
