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