import java.io.*; import java.util.*; public class Main_yukicoder467 { 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 % maxd == 0) { pr.println(maxx / maxd); return; } else { int cnt = maxx / maxd; Set hs = new HashSet<>(); Set hstmp = new HashSet<>(); for (int e : d) { hs.add((long)e); } for (int i = 0; i <= cnt; i++) { if (hs.contains((long)(maxx - maxd * (cnt - i)))) { pr.println(cnt + 1); return; } hstmp.clear(); for (long e : hs) { for (int e1 : d) { hstmp.add(e + e1); } } hs.addAll(hstmp); } if (x != y) { pr.println(maxx / maxd + 2); } else { pr.println(maxx / maxd + 2 + 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); } } }