#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  vector<int> v(n);
  for (int i = 0; i < n; i++) cin >> v[i];
  sort(v.begin(), v.end());
  int out = n;
  int cur = n / 2;
  for (int i = 0; i < n / 2 && cur < n; i++) {
    while (true) {
      if (v[i] * 2 <= v[cur]) {
        out--, cur++;
        break;
      } else {
        cur++;
        if (cur == n) break;
      }
    }
  }
  cout << out << endl;
  return 0;
}
