#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template <class T>
using V = vector<T>;
template <class T, class U>
using P = pair<T, U>;
using vll = V<ll>;
using vvll = V<vll>;
template <class T>
inline bool chmax(T& a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
template <class T>
inline bool chmin(T& a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
const long long MOD = 1000000007;
const long long HIGHINF = (long long)1e18;
const int INF = (int)1e9;
int n;
vll a;
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cin >> n;
  a.resize(n);
  for (int i = 0; i < n; i++) cin >> a[i];
  vll acca(n + 1, 0);
  for (int i = 0; i < n; i++) acca[i + 1] = acca[i] + a[i];
  map<ll, int> acm;
  int ans = 0;
  for (int i = 0; i < n + 1; i++) {
    ans += acm[acca[i]];
    acm[acca[i]]++;
  }
  cout << ans << '\n';
  return 0;
}
