#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
ld pie=3.14159265359;
ll inf=80010010010010010;
ll mod=998244353;
int main(){
    ll d;
    cin >> d;
    ll ans=d;
    for (ll i = 1; i < 66; i++)
    {
        ll left=0,right=d+1;
        while (right-left>1)
        {
            ll mid=(right+left)/2;
            ll x=mid;
            ll now=0;
            for (ll j = 0; j < i; j++)
            {
                now+=x;
                x/=2;
            }
            if (now>d)
            {
                right=mid;
            }else{
                left=mid;
            }
        }
        ll now=0;
        ll z=left;
        for (ll j = 0; j < i; j++)
        {
            now+=z;
            z/=2;
        }
        if (d==now)
        {
            ans=min(ans,left);
        }
    }
    cout << ans << endl;
}