#include <iostream>

using namespace std;
int nrsol,SOL[1001],k,i,j;
int main()
{

    cin>>k;
    for(i=10;i>=0;i--)
    {
        if((1<<i)<=k)
        {
            for(j=(1<<i);j<(1<<(i+1));j++)
                SOL[++nrsol] = j;
            k-=(1<<i);
        }
    }
    cout<<nrsol<<'\n';
    for(i=1;i<=nrsol;i++)
        cout<<SOL[i]<<' ';
    return 0;
}