import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 0;
        long tmp = 1;
        while(h > 0) {
            h /= 2;
            ans += tmp;
            tmp *= 2;
        }
        System.out.println(ans);
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 0;
        long tmp = 1;
        while(h > 0) {
            h /= 2;
            ans += tmp;
            tmp *= 2;
        }
        System.out.println(ans);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 0;
        long tmp = 1;
        while(h > 0) {
            h /= 2;
            ans += tmp;
            tmp *= 2;
        }
        System.out.println(ans);
    } main {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 0;
        long tmp = 1;
        while(h > 0) {
            h /= 2;
            ans += tmp;
            tmp *= 2;
        }
        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 = 0; ans 0 long tmp = 1; tmp 1 while(h > 0) {
            h /= 2;
            ans += tmp;
            tmp *= 2;
        } h > 0 h 0 {
            h /= 2;
            ans += tmp;
            tmp *= 2;
        } h /= 2 h 2 ans += tmp ans tmp tmp *= 2 tmp 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) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 0;
        long tmp = 1;
        while(h > 0) {
            h /= 2;
            ans += tmp;
            tmp *= 2;
        }
        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 = 0;
        long tmp = 1;
        while(h > 0) {
            h /= 2;
            ans += tmp;
            tmp *= 2;
        }
        System.out.println(ans);
    }
} Main
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        long ans = 0;
        long tmp = 1;
        while(h > 0) {
            h /= 2;
            ans += tmp;
            tmp *= 2;
        }
        System.out.println(ans);
    }
}