#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n, a[200000], sum = 0, ans = 0;
  map<long long, int> m;
  cin >> n;
  for (int i = 0; i < n; ++i) cin >> a[i];
  m[0]++;
  for (int i = 0; i < n; ++i) {
    sum += a[i];
    m[sum]++;
  }
  for (auto& e : m) ans += e.second * (e.second - 1) / 2;
  cout << ans << endl;
  return 0;
}
