#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 cnt = 0;
  for (int i = 0; i < n; ++i) {
    if (!a[i]) ++cnt;
    int temp = a[i];
    for (int j = i + 1; j < n; j++) {
      temp += a[j];
      if (!temp) ++cnt;
    }
  }
  cout << cnt << endl;
  return 0;
}
