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#include <bits/stdc++.h>
using namespace std;

int b(int n) 
{
    int o = 0;
    
    while (n != 0)
    {
        if (n % 2 == 1)
        {
            o++;
        }

        n /= 2;
    }
    
    return(o);
}

int main()
{
    int n;
    cin >> n;

    vector<int> o(0, 0);
    int i = 0, s = 0;
    bool r = false;

    while (s < n)
    {
        o.push_back(i);
        //cout << i << " ";

        s += b(i);
        i++;
    }
    //cout << "\n";
    if (s == n)
    {
        cout << o.size() - 1 << "\n";
    }
    else
    {
        cout << o.size() - 2 << "\n";
    }

    for (int j = o.size() - 1; j > 0; j--)
    {
        if (b(j) != s - n)
        {
            cout << o[j] << " ";
        }
        else if(r == true)
        {
            cout << o[j] << " ";
        }
        else
        {
            r = true;
        }
    }
}