#include <bits/stdc++.h>
const long long MOD = 1000000007;
using namespace std;
const int MAX = 5100000;
long long fac[MAX], finv[MAX], inv[MAX];
void COMinit() {
  fac[0] = fac[1] = 1;
  finv[0] = finv[1] = 1;
  inv[1] = 1;
  for (int i = 2; i < MAX; i++) {
    fac[i] = fac[i - 1] * i % MOD;
    inv[i] = MOD - inv[MOD % i] * (MOD / i) % MOD;
    finv[i] = finv[i - 1] * inv[i] % MOD;
  }
}
long long COM(int n, int k) {
  if (n < k) return 0;
  if (n < 0 || k < 0) return 0;
  return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}
int main() {
  long long N;
  cin >> N;
  vector<long long> A(N, 0);
  vector<long long> S(N, 0);
  for (int i = 0; i < N; i++) {
    cin >> A[i];
  }
  map<long long, long long> dict;
  S[0] = A[0];
  for (int i = 1; i < N; i++) {
    S[i] = S[i - 1] + A[i];
  }
  for (int i = 0; i <= N; i++) {
    dict[S[i]] += 1;
  }
  long long ans = 0;
  COMinit();
  for (auto x : dict) {
    ans = ans + COM(x.second, 2);
  }
  cout << ans << endl;
  return 0;
}
