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#include <iostream>
#include <vector>

using namespace std;

int pot[21], pref[1000005];
vector<int> v;
int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	int n;
	
	cin >> n;
	
	pot[0] = 1;
	for(int i = 1; i <= 20; ++i) pot[i] = pot[i - 1] * 2;
	
	for(int i = 1 ; i <= n; ++i)
	{
		pref[i] = pref[i - 1];
		for(int j = 0; j <= 20; ++j)
		{
			if(i & pot[j]) ++pref[i];
		}
	}
	
	int k = n;
	
	for(int i = n; i >= 0; --i)
	{
		if(!k) break;
		if(pref[i] < k)
		{
			k -= (pref[i + 1] - pref[i]);
			v.push_back(i + 1);
		}
	}
	
	cout << (int)v.size() << "\n";
	
	for(int i = 0; i < (int)v.size(); ++i)
	{
		cout << v[i] << " ";
	}
	
	return 0;
}