#include <bits/stdc++.h>
using namespace std;
int main() {
  vector<int> p;
  int n, a[100], koal = 0, sum = 0;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a[i];
    sum += a[i];
  }
  koal = a[0];
  for (int i = 1; i < n; i++) {
    if (koal > sum / 2) break;
    if (a[0] >= a[i] * 2) {
      koal += a[i];
      p.push_back(i + 1);
    }
  }
  if (koal > sum / 2) {
    cout << p.size() + 1 << "\n";
    cout << 1 << " ";
    for (int i = 0; i < p.size(); i++) cout << p[i] << " ";
  } else
    cout << 0;
  return 0;
}
