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#include <iostream>
#include <vector>
using namespace std;
int bin1(int x)
{
    int count = 0;
    while (x)
    {
        if (x % 2 == 1)
        {
            count++;
        }
        x /= 2;
    }
    return count;
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin >> n;
    int sum = 0;
    int x = 1;
    while (1)
    {
        sum = sum + bin1(x);
        if (sum >= n)
        {
            break;
        }
        x++;
    }

    vector <int> tab;

    for (int i = x; i > 0; i--)
    {
        if (sum - bin1(i) >= n)
        {
            sum = sum - bin1(i);
        }
        else
        {
            tab.push_back(i);
        }
    }
    cout << tab.size() << "\n";
    for (int i = 0; i < tab.size(); i++)
    {
        cout << tab[i] << " ";
    }
}