#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int parties[101], sum = 0;
  for (int i = 1; i <= n; i++) {
    cin >> parties[i];
    sum += parties[i];
  }
  int alice = parties[1];
  int sumA = alice;
  vector<int> coalition;
  coalition.push_back(1);
  for (int i = 2; i <= n && sumA < (sum / 2) + 1; i++) {
    if (alice >= 2 * parties[i]) {
      coalition.push_back(i);
      sumA += parties[i];
    }
  }
  if (sumA >= (sum / 2) + 1) {
    cout << coalition.size() << endl;
    for (int i = 0; i < coalition.size(); i++) {
      cout << coalition[i] << " ";
    }
  } else {
    cout << 0;
  }
}
