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

public class Main{
    Scanner scan = new Scanner(System.in);
    long H;

    Main(){
        H = scan.nextLong();
        System.out.println(f(H));
    }
    public long f(long H){
        if(H == 1){return (long)1;}
        else{
            return 2*f(H/(long)2)+1;
        }
        
    }


    public static void main(String[] args){
        new Main();
    }
}
/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