import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class Main{
	
	
	public static void main(String[] args) throws Exception {
		
		Scanner s=new Scanner(System.in);
		
		
		long n=s.nextLong();
		long ans=0;

		for(int i=1;i<=(Math.log(n)/Math.log(2))+1;i++) {
			ans=ans+(long)Math.pow(2, (Math.floor((Math.log(n)/Math.log(2))))+1-i);
			
		}
		System.out.println(ans);
		
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz