#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>

//#include<bits/stdc++.h>



using namespace std;




int main() {

	unsigned long long int n,a=0,b=0;
	cin>>n;
	bool f=0;
	while(n){
		b+=n;
		if(!f){
		
		if(n%2&&!f){
			a+=2*n;
			f=1;
		}
		else a+=n;
		}n/=2;
	}
	cout<<a-b<<endl;

	return 0;
}