using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;

class Magatro
{

    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int[] d = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
        int x, y;
        string[] s = Console.ReadLine().Split(' ');
        x = Math.Abs(int.Parse(s[0]));
        y = Math.Abs(int.Parse(s[1]));
        int max = Math.Max(x, y);
        int dmax = d.Max();
        if (max == 0)
        {
            Console.WriteLine(0);
            return;
        }
        if (d.Contains(max))
        {
            Console.WriteLine(1);
            return;
        }
        if (dmax > max)
        {
            Console.WriteLine(2);
        }
        else
        {
            Console.WriteLine((max + dmax - 1) / dmax);
        }


    }


}