#include <iostream>
#include <vector>

using namespace std;

const int MOD = 235813;

vector<int> generateNthRowPascalTriangle(int n)
{
    vector<int> nthRow;
    nthRow.push_back(1);

    for (int i = 1; i <= n - 1; ++i)
    {
        vector<int> temp = nthRow;
        for (int j = 1; j < i; ++j)
        {
            nthRow[j] = temp[j - 1] + temp[j];
        }
        nthRow.push_back(1);
    }

    return nthRow;
}

int main()
{
    int n;
    int hot = 0;
    cin >> n;
    vector<int> nthRow = generateNthRowPascalTriangle(n);
    vector<int> data(n);
    vector<long long> m(n);
    long long sum_ = 0;
    for (int i = 0; i < n; i++)
    {
        cin >> data[i];
        m[i] = data[i] * nthRow[i];
        if (i != 0)
            m[i] *= -1;
        sum_ += m[i];
    }
    for (int i = 0; i < n; i++)
    {
        if ((((sum_ - m[i]) % MOD) % nthRow[i] == 0 && (-1e6 <= ((sum_ - m[i]) % MOD) / nthRow[i] <= 1e6) ||
             ((((sum_ - m[i]) % MOD) + MOD) % nthRow[i] == 0 && -1e6 <= (((sum_ - m[i]) % MOD) + MOD) / nthRow[i] <= 1e6) ||
             ((((sum_ - m[i]) % MOD) - MOD) % nthRow[i] == 0 && -1e6 <= (((sum_ - m[i]) % MOD) - MOD) / nthRow[i] <= 1e6)))
        {
            hot += 1;
        }
    }
    cout << hot << endl;

    return 0;
}