import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        @SuppressWarnings("resource")
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 0;
        long mons = 1;
        while (h > 0) {
            ans += mons;
            mons *= (long) 2;
            h /= 2;
        }
        System.out.println(ans);
    }

} import java.util.Scanner; Scanner java.util public class Main {

    public static void main(String[] args) {
        @SuppressWarnings("resource")
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 0;
        long mons = 1;
        while (h > 0) {
            ans += mons;
            mons *= (long) 2;
            h /= 2;
        }
        System.out.println(ans);
    }

} Main public static void main(String[] args) {
        @SuppressWarnings("resource")
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 0;
        long mons = 1;
        while (h > 0) {
            ans += mons;
            mons *= (long) 2;
            h /= 2;
        }
        System.out.println(ans);
    } main {
        @SuppressWarnings("resource")
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 0;
        long mons = 1;
        while (h > 0) {
            ans += mons;
            mons *= (long) 2;
            h /= 2;
        }
        System.out.println(ans);
    } @SuppressWarnings("resource")
        Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long h = sc.nextLong(); h sc.nextLong() sc.nextLong sc long ans = 0; ans 0 long mons = 1; mons 1 while (h > 0) {
            ans += mons;
            mons *= (long) 2;
            h /= 2;
        } h > 0 h 0 {
            ans += mons;
            mons *= (long) 2;
            h /= 2;
        } ans += mons ans mons mons *= (long) 2 mons (long) 2 h /= 2 h 2 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) {
        @SuppressWarnings("resource")
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 0;
        long mons = 1;
        while (h > 0) {
            ans += mons;
            mons *= (long) 2;
            h /= 2;
        }
        System.out.println(ans);
    }

} public class Main {

    public static void main(String[] args) {
        @SuppressWarnings("resource")
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 0;
        long mons = 1;
        while (h > 0) {
            ans += mons;
            mons *= (long) 2;
            h /= 2;
        }
        System.out.println(ans);
    }

} Main
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        @SuppressWarnings("resource")
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 0;
        long mons = 1;
        while (h > 0) {
            ans += mons;
            mons *= (long) 2;
            h /= 2;
        }
        System.out.println(ans);
    }

}