import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		long h = sc.nextLong();
		long count = 0;
		long ans = 1;

		while(h >= 1) {
			h = h / 2;
			count += ans;
			ans *= 2;
		}

		System.out.println(count);

	}

} 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 count = 0;
		long ans = 1;

		while(h >= 1) {
			h = h / 2;
			count += ans;
			ans *= 2;
		}

		System.out.println(count);

	}

} Main public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		long h = sc.nextLong();
		long count = 0;
		long ans = 1;

		while(h >= 1) {
			h = h / 2;
			count += ans;
			ans *= 2;
		}

		System.out.println(count);

	} main {

		Scanner sc = new Scanner(System.in);
		long h = sc.nextLong();
		long count = 0;
		long ans = 1;

		while(h >= 1) {
			h = h / 2;
			count += ans;
			ans *= 2;
		}

		System.out.println(count);

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

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		long h = sc.nextLong();
		long count = 0;
		long ans = 1;

		while(h >= 1) {
			h = h / 2;
			count += ans;
			ans *= 2;
		}

		System.out.println(count);

	}

} public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		long h = sc.nextLong();
		long count = 0;
		long ans = 1;

		while(h >= 1) {
			h = h / 2;
			count += ans;
			ans *= 2;
		}

		System.out.println(count);

	}

} 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 count = 0;
		long ans = 1;

		while(h >= 1) {
			h = h / 2;
			count += ans;
			ans *= 2;
		}

		System.out.println(count);

	}

}
