#include <bits/stdc++.h>
using namespace std;
template <class T>
ostream& operator<<(ostream& stream, const vector<T> v) {
  stream << "[ ";
  for (int i = 0; i < (int)v.size(); i++) stream << v[i] << " ";
  stream << "]";
  return stream;
}
long long fpow(long long x, long long p, long long m) {
  long long r = 1;
  for (; p; p >>= 1) {
    if (p & 1) r = r * x % m;
    x = x * x % m;
  }
  return r;
}
long long inv(long long a, long long b) {
  return a < 2 ? a : ((a - inv(b % a, a)) * b + 1) / a % b;
}
int gcd(int a, int b) {
  if (!b) return a;
  return gcd(b, a % b);
}
long long gcd(long long a, long long b) {
  if (!b) return a;
  return gcd(b, a % b);
}
int N, a[120];
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cin >> N;
  int i, s = 0;
  for (i = 1; i <= N; i++) {
    cin >> a[i];
    s += a[i];
  }
  int tot = a[1];
  vector<int> sol = {1};
  for (i = 2; i <= N; i++)
    if (a[1] >= 2 * a[i]) {
      tot += a[i];
      sol.push_back(i);
    }
  if (2 * tot > s) {
    cout << sol.size() << "\n";
    for (int x : sol) cout << x << " ";
  } else
    cout << "0\n";
}
