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

long long d;

long long solve();
long long calc(int k, long long x);

int main() {
  cin >> d;
  cout << solve() << endl;
  return 0;
}

long long solve() {
  long long res = d;
  for (int i = 1; i < 62; ++i) {
    long long l = 0, r = 1e18;
    while (r - l > 1) {
      long long mid = (l + r) >> 1;
      if (calc(i, mid) >= d)
        r = mid;
      else
        l = mid;
    }
    if (calc(i, r) == d) res = min(res, r);
  }
  return res;
}

long long calc(int k, long long x) {
  long long res = 0;
  for (int i = 0; i < k; ++i) {
    res += x;
    x >>= 1;
  }
  return res;
}