#include<bits/stdc++.h>
#define op ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
int main(){

    int n; cin >> n;
    int cnt = 0;
    int t = n;


    while(n > 1)
    {
        int a = n % 2;
        cnt += n/2;
        n = n/2;
        n+=a;

    }

    cout << cnt + t;

}