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#include <bits/stdc++.h>
using namespace std;

int countZeroTriplets(vector<int>& nums) {
    int count = 0;
    int n = nums.size();

    for (int i = 0; i < n - 2; ++i) {
        for (int j = i + 1; j < n - 1; ++j) {
            for (int k = j + 1; k < n; ++k) {
                if (nums[i] + nums[j] + nums[k] == 0) {
                    ++count;
                }
            }
        }
    }

    return count;
}
vector<int> sums;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin >> n;

    vector<int> arr(n);
    for (int i = 0; i < n; ++i) {
        cin >> arr[i];
    }
     for (int i = 0; i < n; ++i) {
        int sum = 0;
        for (int j = i; j < n; ++j) {
            sum += arr[j];
            sums.push_back(sum);
        }
    }
    cout<<countZeroTriplets(sums);
    return 0;
}