#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define REP(i, n) for (int i = 0; i < (n); ++i)
#define REPR(i, n) for (int i = n - 1; i >= 0; --i)
#define FOR(i, m, n) for (int i = m; i < n; ++i)
#define FORR(i, m, n) for (int i = m; i >= n; --i)
#define ALL(v) (v).begin(),(v).end()
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
const ll INF=1LL<<60;
const int inf=(1<<30)-1;
const int mod=1e9+7;
int dx[8]={1,0,-1,0,-1,-1,1,1};
int dy[8]={0,1,0,-1,-1,1,-1,1};
int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll d;cin >> d;
    ll ans=d;
    FOR(i,1,65){
        ll l=0,r=d;
        while(r-l>1){
            ll mid=(l+r)/2;
            ll num=mid,sum=0;
            while(num){
                sum+=num;
                num/=2;
            }
            if(sum>=d) r=mid;
            else l=mid;
        }
        ll num=r,sum=0;
        REP(j,i){
            sum+=num;
            num/=2;
        }
        if(sum==d) chmin(ans,r);
    }
    cout << ans << endl;
}