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, i = 0;
		while (h >= 1) {
			ans += Math.pow(2, i);
			h /= 2;
			i++;
		}
		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, i = 0;
		while (h >= 1) {
			ans += Math.pow(2, i);
			h /= 2;
			i++;
		}
		System.out.println(ans);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		long h = sc.nextLong();
		long ans = 0, i = 0;
		while (h >= 1) {
			ans += Math.pow(2, i);
			h /= 2;
			i++;
		}
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);

		long h = sc.nextLong();
		long ans = 0, i = 0;
		while (h >= 1) {
			ans += Math.pow(2, i);
			h /= 2;
			i++;
		}
		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 i = 0; i 0 while (h >= 1) {
			ans += Math.pow(2, i);
			h /= 2;
			i++;
		} h >= 1 h 1 {
			ans += Math.pow(2, i);
			h /= 2;
			i++;
		} ans += Math.pow(2, i) ans Math.pow(2, i) Math.pow Math 2 i h /= 2 h 2 i++ i 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, i = 0;
		while (h >= 1) {
			ans += Math.pow(2, i);
			h /= 2;
			i++;
		}
		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, i = 0;
		while (h >= 1) {
			ans += Math.pow(2, i);
			h /= 2;
			i++;
		}
		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, i = 0;
		while (h >= 1) {
			ans += Math.pow(2, i);
			h /= 2;
			i++;
		}
		System.out.println(ans);
	}
}