#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int a[n];
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  int sum = 0, count = 0;
  for (int i = 0; i < n; i++) {
    for (int j = i; j < n; j++) {
      sum += a[j];
      if (sum == 0) {
        count++;
      }
    }
  }
  cout << count << endl;
  return 0;
}
