import java.util.*;

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

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