import java.math.BigInteger;
import java.util.Scanner;

public class Main{
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		while(sc.hasNext()){
			BigInteger n=sc.nextBigInteger();
			BigInteger sum=n.divide(BigInteger.valueOf(2));
			BigInteger max=n.max(n); n=n.divide(BigInteger.valueOf(2));
			while(n.compareTo(BigInteger.ZERO)==1){
				n=n.divide(BigInteger.valueOf(2));
				sum=sum.add(n);
			}
			System.out.println(max.subtract(sum).toString());
		}
	}
}