#include<bits/stdc++.h>
using namespace std;
int main(){
    int a;
    cin >> a;
    int rem = 0;
    int sum = 0;
    while(a > 1){
        sum += a;
        int temp = a;
        a =  floor((a+rem)/2);
                rem = temp % 2;

    }
    if(a == 1 & rem == 1){
        sum++;
    }
    cout << sum+2 << endl;
    return 0;
}