#include <bits/stdc++.h>
using namespace std;

using ll = long long;

int main() {
  ll d;
  cin >> d;
  
  ll left = 0, right = 1e18;
  while (left + 1 < right) {
    ll mid = (left + right) / 2;
    ll now = mid, acc = 0;
    while (now > 0) {
      acc += now;
      now /= 2;
    }
    if (acc >= d) right = mid;
    else left = mid;
  }
  
  for (ll i = right; i < right + 1e7; i++) {
    ll keep = i, now2 = 0;
    while (keep > 0) {
      now2 += keep;
      keep /= 2;
      if (now2 == d) {
        cout << i << '\n';
        return 0;
      }
      else if (now2 > d) break;
    }
  }
  
  cout << d << '\n';
}