#include<bits/stdc++.h>
using namespace std;
#define int long long
#define REP(i,m,n) for(int i=(m);i<(n);i++)
#define rep(i,n) REP(i,0,n)
#define pb push_back
#define all(a) a.begin(),a.end()
#define rall(c) (c).rbegin(),(c).rend()
#define mp make_pair
#define endl '\n'
#define vec vector<ll>
#define mat vector<vector<ll> >
#define fi first
#define se second
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll,ll> pll;
typedef long double ld;
typedef complex<double> comp;
const ll INF=1e9+7;
const ll inf=INF*INF;
const ll MOD=1e9+7;
const ll mod=MOD;
const int MAX=1000010;
const double PI=acos(-1.0);


signed main(){
    ll d;cin>>d;
    ll ma=0;
    rep(i,64){
        if((1LL<<i)&d)ma=i+1;
    }
    ll ans=d;
    rep(i,ma+1){
        ll l=(1LL<<i),r=d;
        while(r-l>1){
            ll mid=(r+l)/2;
            ll cnt=0;
            ll c=mid;
            rep(j,i+1){
                cnt+=c;
                c/=2;
            }
            if(cnt>=d)r=mid;
            else l=mid;
        }
        ll cnt=0;
        ll c=r;
        rep(j,i+1){
            cnt+=c;
            c/=2;
        }
        if(cnt==d)ans=min(ans,r);
    }
    cout<<ans<<endl;
}