import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.Set;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		final long N = sc.nextLong();
		
		long max = 0;
		for(long n = N; n > 0; n /= 2){
			max += n;
		}
		
		System.out.println(N * 2 - max);
	}

}