#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int64_t N;
  cin >> N;
  function<int64_t(int64_t, bool)> rec = [&](int64_t n, bool c) {
    if (n == 0) return INT64_C(0);
    int64_t res = n + rec(n / 2, c);
    if (c) {
      res = 0;
    } else {
      res = max(res, 2 * n + rec(n / 2, true));
    }
    return res;
  };
  int64_t A = 0, B = rec(N, false);
  while (N > 0) {
    A += N;
    N /= 2;
  }
  cout << abs(A - B) << '\n';
  return 0;
}