import java.util.Scanner;
public class CopyOfMain {
	public static void main(String[] args){
		Scanner S = new Scanner(System.in);
		int N = S.nextInt();
		int count=0;
		
		if(N==1)
			System.out.println(0);
		
		String n = Integer.toBinaryString(N+1);
		
		for(int i=0;i<n.length()-1;i++){
			if(n.charAt(i) == '1')
				count += (n.length() -1 -i);
		}
		
		System.out.println(count);
	}
}