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#include <bits/stdc++.h>

using namespace std;

int getBits(int number)
{
    int counter = 0;
    while (number)
    {
        counter += number & 1;
        number >>= 1;
    }
    return counter;
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    vector<int> result;
    int n, counter = 0;
    cin >> n;

    for (int i = 0; counter < n; i++)
    {
        counter += getBits(i + 1);
        result.push_back(i + 1);

        if (counter > n)
        {
            for (auto it = result.end() - 1; it != result.begin() - 1; it--)
            {
                if (getBits(*it) == counter - n)
                {
                    counter = n;
                    result.erase(it);
                    break;
                }
            }

            if (counter != n)
            {
                int j = i + 1;

                while (getBits(j) != counter - n)
                    j++;
                result.push_back(j);
            }

            break;
        }
    }

    cout << result.size() << '\n';
    for (auto it = result.end() - 1; it != result.begin() - 1; it--)
    {
        cout << *it << " ";
    }

    return 0;
}