#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, num = 0;
  cin >> n;
  int a[n + 1];
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
    int sum = 0;
    for (int j = i; j >= 1; j--) {
      sum += a[j];
      if (sum == 0) num++;
    }
  }
  cout << num;
  return 0;
}
