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

using ll = long long;

int main() {
  ll d;
  cin >> d;
  
  for (ll i = 100; i >= 1; i--) {
    ll left = 0, right = 1e18;
    while (left + 1 < right) {
      ll mid = (left + right) / 2, keep = mid, now = 0;
      for (ll j = 0; j < i; j++) {
        now += keep;
        keep /= 2;
      }
      if (now >= d) right = mid;
      else left = mid;
    }
    ll now = 0, right2 = right;
    for (ll j = 0; j < i; j++) {
      now += right2;
      right2 /= 2;
    }
    if (now == d) {
      cout << right << '\n';
      return 0;
    }
  }
}