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