#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
  int n;
  cin >> n;
  map<int, ll> p;
  p[0] = 1;
  ll sum = 0;
  ll ans = 0;
  while (n--) {
    int temp;
    cin >> temp;
    sum += temp;
    ans += p[sum];
    p[sum]++;
  }
  cout << ans << "\n";
  return 0;
}
