#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
using namespace std;

int main()
{
    int n;
    cin >> n;
    vector<int> d(n);
    for(int i=0; i<n; ++i)
        cin >> d[i];

    int x, y;
    cin >> x >> y;
    x = max(abs(x), abs(y));
    if(x == 0){
        cout << 0 << endl;
        return 0;
    }
    for(int i=0; i<n; ++i){
        if(d[i] == x){
            cout << 1 << endl;
            return 0;
        }
    }

    int dMax = *max_element(d.begin(), d.end());
    int ans = (x + dMax - 1) / dMax;
    ans = max(2, ans);
    cout << ans << endl;

    return 0;
}