import java.util.*;
import java.util.stream.*;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 1;
        long count = 1;
        while (h > 1) {
            h = h/2;
            ans += Math.pow(2, count);
            count++;
        }
        System.out.println(ans);
    }

} import java.util.*; util.* java import java.util.stream.*; stream.* java.util public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 1;
        long count = 1;
        while (h > 1) {
            h = h/2;
            ans += Math.pow(2, count);
            count++;
        }
        System.out.println(ans);
    }

} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 1;
        long count = 1;
        while (h > 1) {
            h = h/2;
            ans += Math.pow(2, count);
            count++;
        }
        System.out.println(ans);
    } main {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 1;
        long count = 1;
        while (h > 1) {
            h = h/2;
            ans += Math.pow(2, count);
            count++;
        }
        System.out.println(ans);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long h = sc.nextLong(); h sc.nextLong() sc.nextLong sc long ans = 1; ans 1 long count = 1; count 1 while (h > 1) {
            h = h/2;
            ans += Math.pow(2, count);
            count++;
        } h > 1 h 1 {
            h = h/2;
            ans += Math.pow(2, count);
            count++;
        } h = h/2 h h/2 h 2 ans += Math.pow(2, count) ans Math.pow(2, count) Math.pow Math 2 count count++ count System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 1;
        long count = 1;
        while (h > 1) {
            h = h/2;
            ans += Math.pow(2, count);
            count++;
        }
        System.out.println(ans);
    }

} public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 1;
        long count = 1;
        while (h > 1) {
            h = h/2;
            ans += Math.pow(2, count);
            count++;
        }
        System.out.println(ans);
    }

} Main
import java.util.*;
import java.util.stream.*;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 1;
        long count = 1;
        while (h > 1) {
            h = h/2;
            ans += Math.pow(2, count);
            count++;
        }
        System.out.println(ans);
    }

}
