#include <bits/stdc++.h>
#define MOD 1000000007LL
using namespace std;
typedef long long ll;
typedef pair<int,int> P;

ll dp[3001][3001];

ll func(ll n){
	if(n<=1LL)return 0;
	if(n%2LL==0LL){
		return func(n/2LL)+n/2LL;
	}else{
		return 2LL*func((n-1LL)/2LL);
	}
}

int main(void){
	ll n;
	scanf("%lld",&n);
	printf("%lld\n",func(n));
	return 0;
}