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#include <bits/stdc++.h>

using namespace std;

int ile_bin(int x){
    int il = 0;
    while(x){
        if(x % 2 == 1)
            il++;
        x /= 2;
    }
    return il;
}

int main()
{
    int n;
    int suma = 0;
    cin >> n;
    int i = 1;
    while(suma < n)
        suma += ile_bin(i++);
    i--;
    vector <int> liczby;
    while(i > 0){
        if(suma > n){
            if(suma - ile_bin(i) >= n){
                suma -= ile_bin(i);
                i--;
                continue;
            }
        }
        liczby.push_back(i);
        i--;
    }
    cout << liczby.size() << endl;
    for(auto a: liczby)
        cout << a << " ";
    
}