#include <bits/stdc++.h>
using namespace std;
int main() {
  int N;
  cin >> N;
  map<int, int> m;
  m[0] = 1;
  long long total = 0, ans = 0;
  for (int i = 0; i < N; i++) {
    int x;
    cin >> x;
    total += x;
    ans += m[total];
    m[total] += 1;
  }
  cout << ans << endl;
  return 0;
}
