#include<bits/stdc++.h>
#include<cmath>
using namespace std;

int main(){
    int n,sum=0;
    cin>>n;
    int rem=n%2;
    while(1){
      sum+=n;
      n=n/2;
      sum+=n;
      n=n/2;
      sum+=n;
      if(n%2==1){
         sum+=rem;
         break;
      }

    }
    cout<<sum;

}