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