#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n;
  cin >> n;

  vector<int> d(n);
  for (int i = 0; i < n; i++)
    cin >> d[i];
  int x, y;
  cin >> x >> y;

  int l = max(abs(x), abs(y));
  if (l == 0) {
    cout << 0 << endl;
  } else if (find(d.begin(), d.end(), l) != d.end()) {
    cout << 1 << endl;
  } else {
    int dm = *max_element(d.begin(), d.end());
    int ret = max(2, (l + dm - 1) / dm);
    cout << ret << endl;
  }
  
  return 0;
}