import java.io.*;
import java.util.*;


public class Main_yukicoder467_1 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		int n = sc.nextInt();

		int[] d = new int[n];
		for (int i = 0; i < n; i++) {
			d[i] = sc.nextInt();
		}
		Arrays.sort(d);
		int maxd = d[n - 1];

		int x = Math.abs(sc.nextInt());
		int y = Math.abs(sc.nextInt());
		int maxx = Math.max(x, y);

		if (maxx == 0) {
			pr.println(0);
			return;
		}

		for (int e : d) {
			if (e == maxx) {
				pr.println(1);
				return;
			}
		}

		if (maxx % maxd == 0) {
			pr.println(maxx / maxd);
		} else {
			pr.println(Math.max(0, maxx / maxd - 1) + 2);
		}
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}