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