/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.11.13 21:58:13
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

ll solve(ll n,int cnt) {
    ll res = 0;
    while(n && cnt > 0) {
        res += n;
        
        n >>= 1;
        cnt--;
    }
    return res;
}
int main() {
    ll d;cin >> d;
    ll ans = d;
    for (ll i = 1,cnt = 2; i < d; i*=2,cnt+=1) {
        ll l = 0, r = d;
        while(r - l > 1) {
            ll mid = l + (r - l) /2;
            ll n = solve(mid,cnt);
            if (n >= d) {
                r = mid;
            }
            else {
                l = mid;
            }
        }
        
        if (d == solve(r,cnt)) {
            ans = min(ans,r);
        }
    }
    cout << ans << endl;
    return 0;
}