import java.util.*;

public class Main {
    public static void main(String[] args){
        Scanner scan = new Scanner( System.in );

        long health = Long.parseLong(scan.next());
        health = Recursive(health);
        System.out.println(health);
    }

    public static long Recursive(long health){
        if(health == 1){
            return health;
        }else{
            long returnNum = Recursive(health/2);
            return 2*returnNum + 1;
        }
    }
}
/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