#include "bits/stdc++.h"

#define REP(i,n) for(ll i=0;i<ll(n);++i)
#define RREP(i,n) for(ll i=ll(n)-1;i>=0;--i)
#define FOR(i,m,n) for(ll i=m;i<ll(n);++i)
#define RFOR(i,m,n) for(ll i=ll(n)-1;i>=ll(m);--i)
#define ALL(v) (v).begin(),(v).end()
#define UNIQUE(v) v.erase(unique(ALL(v)),v.end());
#define DUMP(v) REP(aa, (v).size()) { cout << v[aa]; if (aa != v.size() - 1)cout << " "; else cout << endl; }
#define INF 1000000001ll
#define MOD 1000000007ll
#define EPS 1e-9

const int dx[8] = { 1,1,0,-1,-1,-1,0,1 };
const int dy[8] = { 0,1,1,1,0,-1,-1,-1 };


using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
ll max(ll a, int b) { return max(a, ll(b)); }
ll max(int a, ll b) { return max(ll(a), b); }
ll min(ll a, int b) { return min(a, ll(b)); }
ll min(int a, ll b) { return min(ll(a), b); }
///(´・ω・`)(´・ω・`)(´・ω・`)(´・ω・`)(´・ω・`)(´・ω・`)///


int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	int n;
	cin >> n;
	vl v(n);
	REP(i, n)cin >> v[i];
	ll x, y;
	cin >> x >> y;
	if (x == 0 && y == 0) {
		cout << 0 << endl;
		return 0;
	}
	vl o, e;
	REP(i, n) {
		if (v[i] % 2 == 0)e.push_back(v[i]);
		else o.push_back(v[i]);
	}
	sort(ALL(o));
	sort(ALL(e));
	ll dist = abs(x) + abs(y);
	REP(i, n) {
		if (v[i] == dist) {
			cout << 1 << endl;
			return 0;
		}
	}
	REP(i, n) {
		if ((dist - v[i]) % 2 == 0) {
			int c;
			if (dist <= v[i]) {
				c = lower_bound(ALL(e), v[i] - dist) - e.begin();
			}
			else {
				c = lower_bound(ALL(e), dist - v[i]) - e.begin();

			}
			if (c != e.size() && e[c] <= dist + v[i]) {
				cout << 2 << endl;
				return 0;
			}

		}
		else {
			int c;
			if (dist <= v[i]) {
				c = lower_bound(ALL(o), v[i] - dist) - o.begin();
			}
			else {
				c = lower_bound(ALL(o), dist - v[i]) - o.begin();

			}
			if (c != o.size() && o[c] <= dist + v[i]) {
				cout << 2 << endl;
				return 0;
			}
		}
	}
	cout << -1 << endl;

}