#include <iostream>
#include <string>
#include <queue>
#include <stack>
#include <algorithm>
#include <list>
#include <vector>
#include <complex>
#include <utility>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <climits>
#include <bitset>
#include <ctime>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <cassert>
#include <cstddef>
#include <iomanip>
#include <numeric>
#include <tuple>
#include <sstream>
#include <fstream>

using namespace std;
#define REP(i, n) for (int (i) = 0; (i) < (n); (i)++)
#define FOR(i, a, b) for (int (i) = (a); (i) < (b); (i)++)
#define RREP(i, a) for(int (i) = (a) - 1; (i) >= 0; (i)--)
#define FORR(i, a, b) for(int (i) = (a) - 1; (i) >= (b); (i)--)
#define DEBUG(C) cerr << #C << " = " << C << endl;
using LL = long long;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<LL>;
using VVL = vector<VL>;
using VD = vector<double>;
using VVD = vector<VD>;
using PII = pair<int, int>;
using PDD = pair<double, double>;
using PLL = pair<LL, LL>;
using VPII = vector<PII>;
template<typename T> using VT = vector<T>;
#define ALL(a) begin((a)), end((a))
#define RALL(a) rbegin((a)), rend((a))
#define SORT(a) sort(ALL((a)))
#define RSORT(a) sort(RALL((a)))
#define REVERSE(a) reverse(ALL((a)))
#define MP make_pair
#define FORE(a, b) for (auto &&a : (b))
#define FIND(s, e) ((s).find(e) != (s).end())
#define EB emplace_back

const int INF = 1e9;
const int MOD = INF + 7;
const LL LLINF = 1e18;

long long gcd(long long a, long long b) {
    if(a < b) swap(a, b);
    long long ret = 1;
    while(b) {ret = b; b = a % b; a = ret;}
    return ret;
}

long long lcm(long long a, long long b) {
    return (a * b) / gcd(a, b);
}

int n;
set<int> d;
int x, y;

int main(void) {
	cin >> n;
	REP(i, n) {
		int buf;
		cin >> buf;
		d.insert(buf);
	}
	cin >> x >> y;
	if (x == y && x == 0) {
		cout << 0 << endl;
		return 0;
	}
	int dis = max(abs(x), abs(y));
	FORE(e, d) {
		if (e == dis) {
			cout << 1 << endl;
			return 0;
		}
	}
	int maxd = *max_element(ALL(d));
	int ans = dis / maxd;
	ans += ans == 0;
	if (maxd * ans == dis) {
		cout << ans << endl;
	} else {
		cout << ans + 1 << endl;
	}
}