import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();

        long ans = 0;
        
        for(int i = 0 ; h > 0 ; i++){
        	ans += (long)1 << i;
        	h >>= 1;
        }

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

        long ans = 0;
        
        for(int i = 0 ; h > 0 ; i++){
        	ans += (long)1 << i;
        	h >>= 1;
        }

        System.out.println(ans);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();

        long ans = 0;
        
        for(int i = 0 ; h > 0 ; i++){
        	ans += (long)1 << i;
        	h >>= 1;
        }

        System.out.println(ans);
    } main {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();

        long ans = 0;
        
        for(int i = 0 ; h > 0 ; i++){
        	ans += (long)1 << i;
        	h >>= 1;
        }

        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 for(int i = 0 ; h > 0 ; i++){
        	ans += (long)1 << i;
        	h >>= 1;
        } int i = 0 ; int i = 0 ; i 0 h > 0 h 0 i++ i++ i {
        	ans += (long)1 << i;
        	h >>= 1;
        } {
        	ans += (long)1 << i;
        	h >>= 1;
        } ans += (long)1 << i ans (long)1 << i (long)1 i h >>= 1 h 1 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;
        
        for(int i = 0 ; h > 0 ; i++){
        	ans += (long)1 << i;
        	h >>= 1;
        }

        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;
        
        for(int i = 0 ; h > 0 ; i++){
        	ans += (long)1 << i;
        	h >>= 1;
        }

        System.out.println(ans);
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();

        long ans = 0;
        
        for(int i = 0 ; h > 0 ; i++){
        	ans += (long)1 << i;
        	h >>= 1;
        }

        System.out.println(ans);
    }
}