using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Globalization;
using static System.Console;
using Pair = System.Collections.Generic.KeyValuePair<int, int>;

class Program
{
    static void Main()
    {
        //var sw = new StreamWriter(OpenStandardOutput()) { AutoFlush = false };
        //SetOut(sw);
        new Program().solve();
        //Out.Flush();
    }
    Scanner cin = new Scanner();
    readonly int[] dd = { 0, 1, 0, -1, 0 };
    readonly int mod = 1000000007;
    readonly string alfa = "abcdefghijklmnopqrstuvwxyz";
    
    
	int n, x, y;
	
    void solve()
    {
       n = cin.nextint;
       var d = cin.scanint;
       x = cin.nextint;
       y = cin.nextint;
       
  	   int z = Math.Max(Math.Abs(x),Math.Abs(y));
  	   if(z == 0)
  	   {
  	   	WriteLine(0);
  	   	return;
  	   }
  	 	foreach(var v in d)
  	 	{
  	 		if(z == v)
  	 		{
  	 			WriteLine(1);
  	 			return;
  	 		}
  	 	}
  	 	
  	 	int max = d.Max();
  	 	int cnt = 0;
  	 	while(z > 2 * max)
  	 	{
  	 		z -= max;
  	 		cnt++;
  	 	}
  	 	WriteLine(cnt + ((z == max)? 1 : 2));
		
    }

}

class Scanner
{
    string[] s; int i;
    char[] cs = new char[] { ' ' };
    public Scanner(){ s = new string[0]; i = 0;}
    public string[] scan { get { return ReadLine().Split(); } }
    public int[] scanint { get { return Array.ConvertAll(scan, int.Parse); } }
    public long[] scanlong { get { return Array.ConvertAll(scan, long.Parse); } }
    public double[] scandouble { get { return Array.ConvertAll(scan, double.Parse); } }
    public string next
    {   get
        {
            if (i < s.Length) return s[i++];
            string st = ReadLine();
            while (st == "") st = ReadLine();
            s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
            i = 0;
            return next;
        }
    }
    public int nextint { get { return int.Parse(next); } }
    public long nextlong { get { return long.Parse(next); } }
    public double nextdouble { get { return double.Parse(next); } }
}