#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;

int main() {
    int n; cin >> n;
    int d = 0;
    while (n--) {
        int x; cin >> x; d = max(d, x);
    }
    int x, y; cin >> x >> y;
    int ma = max(abs(x), abs(y));
    if (ma == 0) {
        cout << 0 << endl;
    } else if (ma == d) {
        cout << 1 << endl;
    } else if (ma < d * 2) {
        cout << 2 << endl;
    } else {
        cout << (ma + d - 1) / d << endl;
    }
    return 0;
}