#include <bits/stdc++.h>
using namespace std;
const int N = 120;
int n, cnt, sum;
int arr[N];
queue<int> ans;
int main() {
  ios::sync_with_stdio(0), cin.tie(0);
  cin >> n >> arr[1];
  sum = arr[1];
  cnt += arr[1];
  ans.push(1);
  for (int i = 2; i <= n; i++) {
    cin >> arr[i];
    if (arr[i] <= arr[1] / 2) {
      cnt += arr[i];
      ans.push(i);
    }
    sum += arr[i];
  }
  if (cnt > sum / 2) {
    cout << ans.size() << endl;
    while (ans.size() > 0) {
      cout << ans.front() << " ";
      ans.pop();
    }
  } else {
    cout << 0;
  }
}
