import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        long hp = scanner.nextLong();
        scanner.close();

        long sumAttack = 0;
        long nextHp = hp;
        long numMon = 1;
        while(true) {
            if(nextHp != 1) {
                sumAttack += numMon;
                nextHp = nextHp / 2;
                numMon = numMon * 2;
            } else {
                sumAttack += numMon;
                break;
            }
        }

        System.out.println(sumAttack);
    }
}
/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