#include <bits/stdc++.h>
using namespace std;
const int inf = 0x3f3f3f3f;
long long nums[200009];
long long m;
map<long long, long long> mp;
int main() {
  int n;
  int ans = 0;
  scanf("%d", &n);
  mp.clear();
  long long all = 0;
  for (int i = 0; i < n; i++) {
    scanf("%lld", &m);
    all += m;
    mp[all]++;
  }
  long long res = 0;
  mp[res]++;
  map<long long, long long>::iterator it;
  for (it = mp.begin(); it != mp.end(); it++) {
    res += (it->second >> 1) * (it->second - 1);
  }
  printf("%lld\n", res);
  return 0;
}
