#include <bits/stdc++.h>
using namespace std;
int main(void) {
  int N;
  unsigned long long sum, ans = 0;
  int A[200000];
  int table[200001] = {};
  cin >> N;
  for (int i = 0; i < N; i++) cin >> A[i];
  for (int i = N - 1; i >= 0; i--) {
    sum = 0;
    for (int j = i; j < N; j++) {
      sum += A[j];
      if (sum == 0) {
        table[i] = 1 + table[j + 1];
        ans += table[i];
        break;
      }
    }
  }
  cout << ans;
  return 0;
}
