import java.util.Scanner;

public class No378 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		
		long n = s.nextLong();
		long n_max = n * 2;
		long nx = 0;
		
		while (n > 0) {
			nx += n;
			
			if ((n % 2) == 1) n--;
			n /= 2;
		}
		
		System.out.println(n_max - nx);
	}
}