import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str = br.readLine();
		int n = Integer.parseInt(str);
		str = br.readLine();
		String[] dstr = str.split(" ");
		int[] d = new int[n];
		for (int i = 0; i < n; i++)
			d[i] = Integer.parseInt(dstr[i]);
		str = br.readLine();
		String[] coordinate = str.split(" ");
		int x = Integer.parseInt(coordinate[0]);
		int y = Integer.parseInt(coordinate[1]);
		int dst = Math.max(Math.abs(x), Math.abs(y));
		d = Sort(d);
		if (dst == 0)
			System.out.println("0");
		else if (dst < d[0])
			System.out.println("2");
		else if (dst <= d[n - 1]) {
			boolean flag = false;
			for (int dist : d) {
				if (dst == dist) {
					System.out.println("1");
					flag = true;
					break;
				}
			}
			if (!flag)
				System.out.println("2");
		} else {
			if (dst % d[n - 1] == 0)
				System.out.println(dst / d[n - 1]);
			else
				System.out.println(dst / d[n - 1] + 1);
		}

	}

	private static int[] Sort(int[] num) {
		int length = num.length;
		if (length == 1)
			return num;
		else if (length == 2 && num[0] > num[1]) {
			int tmpnum = num[0];
			num[0] = num[1];
			num[1] = tmpnum;
		} else {
			for (int i = 1; i < length; i++) {
				for (int j = 0; j < length - i; j++) {
					if (num[j] > num[j + 1]) {
						int tmpnum = num[j];
						num[j] = num[j + 1];
						num[j + 1] = tmpnum;
					}
				}
			}
		}
		return num;
	}
}