import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
	static class FastReader{
		BufferedReader br ;
		StringTokenizer st;
		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				}
				catch(IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		double nextDouble() {
			return Double.parseDouble(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	}
	public static long log(long x, long b)
	{
	    return (long) (Math.log(x) / Math.log(b));
	}
	public static void main(String[] args) {
		FastReader ob = new FastReader();
		long h =ob.nextLong();
		int k=0;
		long count=0;
		while(h>0) {
			count+=(long)Math.pow(2, k);
			h=h/2;
			k++;
			
		}
		System.out.println(count);
	}
	

} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.StringTokenizer; StringTokenizer java.util public class Main {
	static class FastReader{
		BufferedReader br ;
		StringTokenizer st;
		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				}
				catch(IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		double nextDouble() {
			return Double.parseDouble(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	}
	public static long log(long x, long b)
	{
	    return (long) (Math.log(x) / Math.log(b));
	}
	public static void main(String[] args) {
		FastReader ob = new FastReader();
		long h =ob.nextLong();
		int k=0;
		long count=0;
		while(h>0) {
			count+=(long)Math.pow(2, k);
			h=h/2;
			k++;
			
		}
		System.out.println(count);
	}
	

} Main public static long log(long x, long b)
	{
	    return (long) (Math.log(x) / Math.log(b));
	} log {
	    return (long) (Math.log(x) / Math.log(b));
	} return (long) (Math.log(x) / Math.log(b)); (long) (Math.log(x) / Math.log(b)) Math.log(x) Math.log Math x Math.log(b) Math.log Math b long x x long b b public static void main(String[] args) {
		FastReader ob = new FastReader();
		long h =ob.nextLong();
		int k=0;
		long count=0;
		while(h>0) {
			count+=(long)Math.pow(2, k);
			h=h/2;
			k++;
			
		}
		System.out.println(count);
	} main {
		FastReader ob = new FastReader();
		long h =ob.nextLong();
		int k=0;
		long count=0;
		while(h>0) {
			count+=(long)Math.pow(2, k);
			h=h/2;
			k++;
			
		}
		System.out.println(count);
	} FastReader ob = new FastReader(); ob new FastReader() long h =ob.nextLong(); h ob.nextLong() ob.nextLong ob int k=0; k 0 long count=0; count 0 while(h>0) {
			count+=(long)Math.pow(2, k);
			h=h/2;
			k++;
			
		} h>0 h 0 {
			count+=(long)Math.pow(2, k);
			h=h/2;
			k++;
			
		} count+=(long)Math.pow(2, k) count (long)Math.pow(2, k) Math.pow Math 2 k h=h/2 h h/2 h 2 k++ k System.out.println(count) System.out.println System.out System System.out count String[] args args static class FastReader{
		BufferedReader br ;
		StringTokenizer st;
		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				}
				catch(IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		double nextDouble() {
			return Double.parseDouble(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	} FastReader BufferedReader br ; br StringTokenizer st; st public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		} FastReader {
			br = new BufferedReader(new InputStreamReader(System.in));
		} br = new BufferedReader(new InputStreamReader(System.in)) br new BufferedReader(new InputStreamReader(System.in)) String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				}
				catch(IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		} next {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				}
				catch(IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		} while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				}
				catch(IOException e) {
					e.printStackTrace();
				}
			} st==null || !st.hasMoreElements() st==null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
				try {
					st = new StringTokenizer(br.readLine());
				}
				catch(IOException e) {
					e.printStackTrace();
				}
			} try {
					st = new StringTokenizer(br.readLine());
				}
				catch(IOException e) {
					e.printStackTrace();
				} catch(IOException e) {
					e.printStackTrace();
				} IOException e {
					e.printStackTrace();
				} e.printStackTrace() e.printStackTrace e {
					st = new StringTokenizer(br.readLine());
				} st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt() {
			return Integer.parseInt(next());
		} nextInt {
			return Integer.parseInt(next());
		} return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next double nextDouble() {
			return Double.parseDouble(next());
		} nextDouble {
			return Double.parseDouble(next());
		} return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next long nextLong() {
			return Long.parseLong(next());
		} nextLong {
			return Long.parseLong(next());
		} return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next public class Main {
	static class FastReader{
		BufferedReader br ;
		StringTokenizer st;
		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				}
				catch(IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		double nextDouble() {
			return Double.parseDouble(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	}
	public static long log(long x, long b)
	{
	    return (long) (Math.log(x) / Math.log(b));
	}
	public static void main(String[] args) {
		FastReader ob = new FastReader();
		long h =ob.nextLong();
		int k=0;
		long count=0;
		while(h>0) {
			count+=(long)Math.pow(2, k);
			h=h/2;
			k++;
			
		}
		System.out.println(count);
	}
	

} public class Main {
	static class FastReader{
		BufferedReader br ;
		StringTokenizer st;
		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				}
				catch(IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		double nextDouble() {
			return Double.parseDouble(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	}
	public static long log(long x, long b)
	{
	    return (long) (Math.log(x) / Math.log(b));
	}
	public static void main(String[] args) {
		FastReader ob = new FastReader();
		long h =ob.nextLong();
		int k=0;
		long count=0;
		while(h>0) {
			count+=(long)Math.pow(2, k);
			h=h/2;
			k++;
			
		}
		System.out.println(count);
	}
	

} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
	static class FastReader{
		BufferedReader br ;
		StringTokenizer st;
		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				}
				catch(IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		double nextDouble() {
			return Double.parseDouble(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	}
	public static long log(long x, long b)
	{
	    return (long) (Math.log(x) / Math.log(b));
	}
	public static void main(String[] args) {
		FastReader ob = new FastReader();
		long h =ob.nextLong();
		int k=0;
		long count=0;
		while(h>0) {
			count+=(long)Math.pow(2, k);
			h=h/2;
			k++;
			
		}
		System.out.println(count);
	}
	

}
