#include <bits/stdc++.h>
using namespace std;
int N;
long long A, S, res;
map<long long, long long> mp;
int main() {
  cin >> N;
  mp[0] = 1;
  while (N--) {
    cin >> A;
    S += A;
    ++mp[S];
  }
  for (auto it = mp.begin(); it != mp.end(); ++it) {
    res += it->second * (it->second - 1);
  }
  cout << res << endl;
}
