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#include <bits/stdc++.h>
using namespace std;

const int N = 1e6 + 5;

int n;
int cnt_bits[N];
int pref[N];

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

	cin >> n;
	for (int i = 1; i <= n; i++) {
		cnt_bits[i] = cnt_bits[i ^ (i & (-i))] + 1;
		pref[i] = pref[i - 1] + cnt_bits[i];
	}
	int curr = n;
	vector<int> res;
	for (int i = n; i > 0; i--) {
		if (pref[i - 1] < curr) {
			res.push_back(i);
			curr -= cnt_bits[i];
		}
	}
	cout << (int) res.size() << "\n";
	for (int v : res) {
		cout << v << " ";
	}
	cout << "\n";
}