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#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int count_bits(unsigned int n) {
    int ct = 0;
    while(n) {
        ct += n & 1;
        n >>= 1;
    }
    return ct;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);   
      
    int n;
    cin >> n;

    int cr = 0;
    vector<int> res;
    int i = 1;
    while(cr < n) {
        res.push_back(i);
        cr += count_bits(i);
        ++i;
    }
    while(cr > n) {
        int diff = cr-n;
        
        int maxi = 0;
        
        for(int i = res.size()-2; i >= 0; --i) {
            int ctb = count_bits(res[i]);
            if(ctb <= diff) {
                maxi = i;
                break;
            }
        }

        int vb = count_bits(res[maxi]);
        cr -= vb;
        res.erase(res.begin()+maxi);
    }

    reverse(res.begin(), res.end());

    cout << res.size() << '\n';
    for(int i = 0; i < res.size(); ++i) {
        cout << res[i] << ' ';
    }
    cout << '\n';

    return 0;
}