#include <iostream>

using namespace std;

int main()
{
    int n, m = 0, k = 0;
    cin >> n;

    int a[n+1];

    for(int i = 1; i <= n; i++){
        cin >> a[i];
    }

    int pos[n];
    int sum = 0;

    for(int i = 1; i <= n; i++){
        sum += a[i];
    }

    //cout<<sum<<endl;

    if(a[1] > (sum/2)){
        cout << 1 << "\n" << 1 << endl;
        return 0;
    }

    int j = 1;
    pos[0] = 1;
    m += a[1];

    for(int i = 2; i <= n; i++){
        if(a[1] >= (a[i] * 2)){
            m += a[i];
            //if(m > (sum/2)){
                k++;
                pos[j] = i;
                j++;
            //}
        }

        if(m > (sum/2))
            break;
    }
    //cout << j;

    /*for(int i = 0; i < k; i++){
            cout << pos[i] << " ";
        }

    cout << "\n";*/

    if(k > 0){
        cout << k+1 << endl;
        for(int i = 0; i < k+1; i++){
            cout << pos[i] << " ";
        }

        cout << "\n";
    }
    else{
        cout << 0 << endl;
    }

    return 0;
}