#include <bits/stdc++.h>
using namespace std;
const int maxn = 100;
int n;
int a[maxn];
int main() {
  cin >> n;
  for (int i = 0; i < n; ++i) {
    cin >> a[i];
  }
  int total = a[0];
  int alice = a[0];
  vector<int> ans;
  ans.push_back(1);
  for (int i = 1; i < n; ++i) {
    if (a[i] * 2 <= a[0]) {
      ans.push_back(i + 1);
      alice += a[i];
    }
    total += a[i];
  }
  if (alice * 2 > total) {
    cout << ans.size() << endl;
    for (int i = 0; i < (int)ans.size(); ++i) {
      cout << ans[i] << " ";
    }
    cout << endl;
  } else {
    cout << 0 << endl;
  }
  return 0;
}
