#include <bits/stdc++.h>
using namespace std;
void solve() {
  int x;
  cin >> x;
  int res[x + 1], fin = 0;
  vector<int> v;
  v.push_back(1);
  for (int i = 1; i <= x; ++i) {
    cin >> res[i];
    fin += res[i];
  }
  int sum = res[1];
  for (int i = 2; i <= x; ++i) {
    if (res[1] >= 2 * res[i]) {
      v.push_back(i);
      sum += res[i];
      if (v.size() == x - 1) break;
    }
  }
  if (sum > fin - sum) {
    cout << v.size() << endl;
    for (int i : v) cout << i << " ";
    cout << endl;
  } else
    cout << 0 << endl;
  return;
}
int main() {
  int t = 1;
  while (t--) solve();
  return 0;
}
