#include <bits/stdc++.h>
using namespace std;
int main() {
  int N, input, count = 0, ans = 0;
  long long sum = 0;
  vector<int> A;
  vector<long long> s;
  cin >> N;
  for (int i = 0; i < N; i++) {
    cin >> input;
    A.push_back(input);
  }
  s.push_back(0);
  for (int i = 0; i < N; i++) {
    sum += A[i];
    s.push_back(sum);
  }
  sort(s.begin(), s.end());
  int check = -1;
  for (int i = 0; i < N + 1; ++i) {
    if (s[i] != check) {
      check = s[i];
      count = 0;
    } else {
      count++;
      ans += count;
    }
  }
  cout << ans;
  char qq;
  cin >> qq;
  return 0;
}
