#include <bits/stdc++.h>
using namespace std;
int ans[200], j = 0;
int main() {
  int n, i, d = 0, c, x = 0;
  cin >> n;
  int ara[n];
  for (i = 0; i < n; i++) {
    cin >> ara[i];
    d += ara[i];
  }
  d = d / 2 + 1;
  for (i = 1; i < n; i++) {
    if (ara[0] >= ara[i] * 2) {
      x += ara[i];
      ans[j] = i + 1;
      j++;
    }
  }
  x += ara[0];
  ans[j] = 1;
  j++;
  if (x < d) {
    printf("0");
  } else {
    printf("%d\n", j);
    for (i = 0; i < j; i++) {
      cout << ans[i] << " ";
    }
  }
}
