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

int main() {
  ios::sync_with_stdio(false);

  int64_t D; { cin >> D; }

  int64_t res = 0;
  int64_t d = D;
  for (int i = 60; ~i; --i) {
    int64_t v = (int64_t) 1 << i + 1;
    v -= 1;
    if (d >= v) {
      d -= v;
      res |= v + 1 >> 1;
    }
  }

  auto test = [D](int64_t v) {
    int64_t r = 0;
    while (v && r < D) r += v, v /= 2;
    return r == D;
  };

  while (!test(res)) res += 1;

  cout << res << endl;
}