import java.io.*;
import java.util.*;

public class Main {
    PrintWriter out = new PrintWriter(System.out);
    // no self-loop or multiple edges
    public static void main(String[] args) throws Exception {
        Main main = new Main();
//        main.solve();
        System.out.println(main.solve());
    }
    long solve(){
        Scanner sc = new Scanner(System.in);
        long H = sc.nextLong();
        sc.close();
        long n = 1;
        long ans = 0;
        while(H>0){
            ans += n;
            H /= 2;
            n *= 2;
        }
        return 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