#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
#include <cstring>
#include <deque>
using namespace std;
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)
#define CLR(mat) memset(mat, 0, sizeof(mat))
typedef long long ll;
ll f(ll n) {
  if(n == 0 || n == 1) return 0;
  if(n % 2 == 0) return f(n / 2) + n / 2;
  else return 2 * f(n / 2);
}
int main()
{
  ios::sync_with_stdio(false);
  cin.tie(0);
  ll n; cin >> n;
  cout << f(n) << endl;
  return 0;
}