#include <bits/stdc++.h>
const int INF = 1 << 29;
int main() {
  std::ios_base::sync_with_stdio(false);
  std::cin.tie(NULL);
  ;
  int n;
  std::cin >> n;
  std::vector<int> v(n);
  for (int &it : v) std::cin >> it;
  int alice = v[0];
  int sum = std::accumulate(v.begin(), v.end(), 0);
  int target = sum / 2 + 1;
  std::vector<int> ans;
  ans.push_back(1);
  int cur = alice;
  for (int i = 0; i < n; i++) {
    if (alice < v[i] * 2) continue;
    cur += v[i];
    ans.push_back(i + 1);
    if (cur >= target) break;
  }
  if (cur < target) {
    std::cout << 0;
    exit(0);
  } else {
    std::cout << ans.size() << '\n';
    for (int it : ans) std::cout << it << ' ';
  }
  return 0;
}
