#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("YES");}else{puts("NO");}
#define MAX_N 200005

int main() {
    ll D; cin >> D;
    ll ans = D;
    srep(i,2,64){
        ll l = 1, r = D+1;
        while(l+1<r){
            ll m = (l+r)/2;
            ll tmp = 0;
            ll mm = m;
            rep(j,i){
                tmp += mm;
                mm /= 2; 
            }
            if(tmp > D) r = m;
            else l = m;
        }
        ll tmp = 0;
        ll mm = l;
        rep(j,i){
            tmp += mm;
            mm /= 2;
        }
        if(tmp == D){
            ans = min(ans, l);
        }
    }

    cout << ans << endl;
    return 0;
}