#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int n;
ll sum, ans;
map<ll, int> m;
int main() {
  scanf("%d", &n);
  m[0] = 1;
  for (int i = 0, a; i < n; i++) {
    scanf("%d", &a);
    sum += a;
    ans += m[sum];
    m[sum]++;
  }
  printf("%d\n", ans);
  return 0;
}
