import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
           int sc = in.nextInt();
           long result = 0L;
           for(int i = 1;i<=sc;i+=2){
            result+=i;
           }
           for(int i = 2;i<=sc;i+=2){
            result+=func(i);
           }
           System.out.println(result);
    }
    public static int func(int n){
        while(n%2==0){
            n = n/2;
        }
        return n;
    }
}