#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

bool ok(ll a, ll d){
    ll x = a;
    while(x != 0){
        x /= 2;
        a += x;
    }
    return (a >= d);
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);

    ll D; cin >> D;
    ll r = D+10;
    ll l = 0;
    while(r - l > 1){
        ll mid = (r + l) / 2;

        if(ok(mid, D)) r = mid;
        else l = mid;
    }


    bool ok = false;
    ll s = r, x = r;
    while(x > 0){
        if(s == D) ok = true;
        x /= 2;
        s += x;
    }

    if(ok) cout << r << endl;
    else cout << D << endl;
}