#include<iostream>
#include<vector>
using namespace std;

int main(){

long long  N,counter=0;
long long sum=0; 

cin >> N;

long long n = N;
while(n>0){
    sum += n;
    n /= 2;
    counter++;
}

long long sumTemp=0;
long long sumMax = 2*N;

for(int i=0; i<counter; i++){
    n=N;
    for(int j=0; j<i; j++){
        sumTemp += n;
        n /= 2;
    }
    sumTemp += 2*N;
    if(sumMax > sumTemp) sumMax = sumTemp;
    sumTemp=0;
}
//cout << sumMax << endl;
//cout << sum << endl;
cout << sumMax - sum << endl;

}