#include <bits/stdc++.h>
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int main() {
  ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
  int n, a[105], sum = 0, sum2 = 0, num = 0;
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
    sum += a[i];
    if (i == 1 || a[i] * 2 <= a[1]) {
      sum2 += a[i];
      num++;
    }
  }
  if (sum2 * 2 > sum) {
    cout << num << endl;
    for (int i = 1; i <= n; i++)
      if (i == 1 || a[i] * 2 <= a[1]) cout << i << " ";
    cout << endl;
  } else
    cout << "0" << endl;
  return 0;
}
