#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
#define drep(i, cc, n) for (ll i = (cc); i <= (n); ++i)
#define rep(i, n) drep(i, 0, n - 1)
#define all(a) (a).begin(), (a).end()
#define pb push_back
#define fi first
#define se second

const ll MOD = 1000000007;
const ll MOD2 = 998244353;
const ll INF = 1LL << 60;
const ll MAX_N = 2e5;

int main(){
    ll m;
    cin >> m;

    if(m == 0){
        cout << 1 << endl;
        return 0;
    }

    vector<ll> prime;
    for(ll i=2; i<=1000; i++){
        bool flag = true;
        for(ll j=2; j*j<=i; j++){
            if(i%j == 0){
                flag = false;
                break;
            }
        }

        if(flag) prime.pb(i);
    }

    vector<ll> base(40);
    rep(i, 40) base[i] = (ll)pow(2, i)-1;

    vector<ll> fetch;
    ll now = 39;
    while(m){
        if(base[now] <= m){
            m -= base[now];
            fetch.pb(now);
        }else{
            now--;
        }
    }
    
    vector<ll> ans;
    rep(i, (ll)fetch.size()){
        rep(j, fetch[i]) ans.pb(prime[i]);
    }

    cout << (ll)ans.size() << endl;
    rep(i, (ll)ans.size()) cout << ans[i] << " ";
    cout << endl;
}