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#include <iostream>
#include <vector>
using namespace std;
int last[25];
vector <int> ans;
int bits(int a)
{
    int counter=0;
    while (a > 0){
        if (a&1) counter++;
        a = (a >> 1);
    }
    return counter;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n, sum=0, i=1, del = 0;
    cin >> n;
    while (sum < n){
        int add = bits(i);
        if (sum + add > n){
            del = last[sum + add - n];
            sum = n;
        }
        last[add] = i;
        ans.push_back(i);
        sum += add;
        i++;
    }
    if (del == 0) cout << ans.size() << "\n";
    else cout << ans.size()-1 << "\n";
    for (i = ans.size()-1; i >= 0; i--)
    {
        if (ans[i] != del) cout << ans[i] << " ";
    }
    return 0;
}