#include <bits/stdc++.h>
using namespace std;
void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\'' << x << '\''; }
void __print(const char *x) { cerr << '\"' << x << '\"'; }
void __print(const string &x) { cerr << '\"' << x << '\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }
template <typename T, typename V>
void __print(const pair<T, V> &x) {
  cerr << '{';
  __print(x.first);
  cerr << ',';
  __print(x.second);
  cerr << '}';
}
template <typename T>
void __print(const T &x) {
  int f = 0;
  cerr << '{';
  for (auto &i : x) cerr << (f++ ? "," : ""), __print(i);
  cerr << "}";
}
void _print() { cerr << "]\n"; }
template <typename T, typename... V>
void _print(T t, V... v) {
  __print(t);
  if (sizeof...(v)) cerr << ", ";
  _print(v...);
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  long long N;
  cin >> N;
  vector<long long> A(N);
  vector<long long> cumsum_A(N);
  long long ans = 0;
  for (int i = 0; i < (int)(N); i++) {
    cin >> A[i];
    if (A[i] == 0) ans++;
    if (i == 0) {
      cumsum_A[i] = A[i];
    } else {
      cumsum_A[i] = A[i] + cumsum_A[i - 1];
    }
  }
  map<long long, long long> m;
  m[0]++;
  for (int i = 0; i < (int)(N); i++) {
    m[cumsum_A[i]]++;
  };
  auto begin = m.begin(), end = m.end();
  for (auto iter = begin; iter != end; iter++) {
    ans += ((iter->second) * (iter->second - 1)) / 2;
  }
  cout << ans << endl;
  return 0;
}
