#include <iostream>
#include <vector>

template <class T>
std::ostream& operator<< (std::ostream& stream, const std::vector<T>& vec)
{
    stream << "[ ";
    for (const auto &i: vec) stream << i << " ";
    stream << "]";
    return stream;
}

int main(void)
{
    using namespace std;
    
    // input
    int n_input;
    cin >> n_input;
    
    int tmp;
    vector<int> d;
    for (int i = 0; i < n_input; ++i)
    {
        cin >> tmp;
        d.push_back(tmp);
    }
    cin >> tmp; int x = tmp;
    cin >> tmp; int y = tmp;
    
    // algorithm
    int sum{0};
    for (int i = 0; i < static_cast<int>(d.size()); ++i)
    {
        sum += d.at(i);
        if (sum >= x && sum >= y)
        {
            cout << i + 1 << endl;
            return 0;
        }
        else
            continue;
    }
    cout << -1 << endl;
    return 0;
}