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#include <bits/stdc++.h> //Michał Kuśmirek
using namespace std;     //XIII LO Szczecin

#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define REP(i, n) for(int i = 0; i < (n); ++i)

template<class T> int size(T && a) {
	return (int)(a.size());
}
ostream& operator << (ostream &os, string str) {
    for(char c : str) os << c;
    return os;
}
template <class A, class B> ostream& operator << (ostream &os, const pair<A, B> &p) {
	return os << '(' << p.first << "," << p.second << ')';
}
template <class T> auto operator << (ostream &os, T &&x) -> decltype(x.begin(), os) {
	os << '{';
	for(auto it = x.begin(); it != x.end(); ++it)
		os << *it << (it == prev(x.end()) ? "" : " ");
	return os << '}';
}
template <class T> ostream& operator << (ostream &os, vector<vector<T>> vec) {
    for(auto x : vec)
    	os << "\n  " << x;
    return os;
}
void dump() {}
template <class T, class... Args> void dump(T &&x, Args... args) {
    cerr << x << "; ";
    dump(args...);
}
#ifdef DEBUG
# define debug(x...) cerr << "[" #x "]: ", dump(x), cerr << '\n'
#else 
# define debug(...) 0
#endif

//--------------------------------------------------

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

	int n; cin >> n;

	int bits_sum = 0;
	FOR(x, 1, n)
		bits_sum += __builtin_popcount(x);

	debug(bits_sum);

	vector<bool> take(n + 1, 1);
	for(int x = n; x >= 1; --x) {
		if(bits_sum - __builtin_popcount(x) >= n) {
			bits_sum -= __builtin_popcount(x);
			take[x] = false;
		}
	}

	vector<int> answer;
	FOR(i, 1, n)
		if(take[i]) answer.emplace_back(i);

	reverse(answer.begin(), answer.end());
	cout << size(answer) << '\n';
	for(int x : answer)
		cout << x << ' ';
	cout << '\n';
}