#include <bits/stdc++.h>
using namespace std;
map<long long, long long> p;
int n, a[200000 + 100], sum, ans;
int main() {
  cin >> n;
  p[0] = 1;
  for (int i = 1; i <= n; ++i) {
    cin >> a[i];
    sum += a[i];
    ans += p[sum];
    p[sum]++;
  }
  cout << ans;
}
