#include <iostream>

using namespace std;

int count(int step, int l, int r, int a[])
{
    if (step == 0)
    {
        if (l + a[0] == r || r + a[0] == l)
        {
            return 1;
        }
        return 0;
    }
    return count(step - 1, l + a[step], r, a) + count(step - 1, l, r + a[step], a);
}

int main()
{
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int n;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
    }
    cout << count(n - 1, 0, 0, a) / 2;
}