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#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    int setbits = 0;
    for(int i = n; i > 0; i--){
        setbits += __builtin_popcount(i);
    }
    vector<int> a;
    for(int i = n; i > 0; i--){
        if(setbits - __builtin_popcount(i) < n){
            a.push_back(i);
        }else{
            setbits -= __builtin_popcount(i);
        }
    }
    cout << a.size() << '\n';
    for(int i : a){
        cout << i << ' ';
    }
    cout << '\n';
    
    
    return 0;
}