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#include <iostream>
#include <vector>

using namespace std;

int main()
{
    short outputLength = 0;
    vector<short> numbers;

    cin >> outputLength;

    int singleNumber = 0;
    for (int i = 0; i < outputLength; ++i)
    {
        cin >> singleNumber;
        numbers.emplace_back(singleNumber);
    }

    short a = 0;
    short b = 1;
    short c = 2;

    vector<short> buc;
    int sum = 0;

    //while (a < outputLength)
    //{
    //    sum += numbers[a];
    //    buc.push_back(sum);
    //
    //    while (b < outputLength)
    //    {
    //        sum += numbers[b];
    //        buc.push_back(sum);
    //
    //        while (c < outputLength)
    //        {
    //            sum += numbers[c];
    //            buc.push_back(sum);
    //
    //            c++;
    //        }
    //
    //        //a++;
    //        //b++;
    //        //c = b + 1;
    //        sum = 0;
    //        b++;
    //    }
    //}

    auto begin = 0;
    while (begin < outputLength)
    {
        while (a < outputLength)
        {
            sum += numbers[a];
            buc.push_back(sum);
            a++;
        }
        begin++;
        a = begin;
        sum = 0;
    }

   // cout << buc.size();

    long long result = 0;

    for (auto i = 0; i < buc.size(); ++i)
    {
        for (auto j = i + 1; j < buc.size(); ++j)
        {
            for (auto k = j + 1; k < buc.size(); ++k)
            {
                if (buc[i] + buc[j] + buc[k] == 0)
                {
                    result++;
                }
            }
        }
    }

    cout << result;
}