import java.io.*;
import java.util.*;
import java.math.*;
public class Main{

    static long M=(long)1e9+7;
    public static void main(String[] args) {
        FastReader fs=new FastReader();
        long h=fs.nextLong();
        long count=0;
        long i=1;
        while(h!=1){
            h/=2;
            count+=i;
            i<<=1;
        }
        count+=i;
        System.out.println(count);
    }
    
    public static long min(long a, long mod){
        return pow(a, mod-2,mod);
    }
    public static long mul(long a,long b,long mod){
        long res=0;
        while(b!=0){
            if ((b & 1) == 1){ res = (res + a) % mod;}
            a = (a + a) % mod;
            b >>= 1;
        }
        return res;
    }
    
    public static long pow(long a, long n, long mod){
        long res=1;
        while(n != 0){
            if ((n & 1) == 1) res = mul(res, a, mod)%mod;
            a = mul(a , a, mod)%mod;
            n >>= 1;
        }
        return res;
    }
    
    public static long gcd(long a, long b){
        if(a == 0) return b;
        return b == 0 ? a: gcd(b, a % b);
    }

    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()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 
    }
} import java.io.*; io.* java import java.util.*; util.* java import java.math.*; math.* java public class Main{

    static long M=(long)1e9+7;
    public static void main(String[] args) {
        FastReader fs=new FastReader();
        long h=fs.nextLong();
        long count=0;
        long i=1;
        while(h!=1){
            h/=2;
            count+=i;
            i<<=1;
        }
        count+=i;
        System.out.println(count);
    }
    
    public static long min(long a, long mod){
        return pow(a, mod-2,mod);
    }
    public static long mul(long a,long b,long mod){
        long res=0;
        while(b!=0){
            if ((b & 1) == 1){ res = (res + a) % mod;}
            a = (a + a) % mod;
            b >>= 1;
        }
        return res;
    }
    
    public static long pow(long a, long n, long mod){
        long res=1;
        while(n != 0){
            if ((n & 1) == 1) res = mul(res, a, mod)%mod;
            a = mul(a , a, mod)%mod;
            n >>= 1;
        }
        return res;
    }
    
    public static long gcd(long a, long b){
        if(a == 0) return b;
        return b == 0 ? a: gcd(b, a % b);
    }

    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()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 
    }
} Main static long M=(long)1e9+7; M (long)1e9+7 (long)1e9 7 public static void main(String[] args) {
        FastReader fs=new FastReader();
        long h=fs.nextLong();
        long count=0;
        long i=1;
        while(h!=1){
            h/=2;
            count+=i;
            i<<=1;
        }
        count+=i;
        System.out.println(count);
    } main {
        FastReader fs=new FastReader();
        long h=fs.nextLong();
        long count=0;
        long i=1;
        while(h!=1){
            h/=2;
            count+=i;
            i<<=1;
        }
        count+=i;
        System.out.println(count);
    } FastReader fs=new FastReader(); fs new FastReader() long h=fs.nextLong(); h fs.nextLong() fs.nextLong fs long count=0; count 0 long i=1; i 1 while(h!=1){
            h/=2;
            count+=i;
            i<<=1;
        } h!=1 h 1 {
            h/=2;
            count+=i;
            i<<=1;
        } h/=2 h 2 count+=i count i i<<=1 i 1 count+=i count i System.out.println(count) System.out.println System.out System System.out count String[] args args public static long min(long a, long mod){
        return pow(a, mod-2,mod);
    } min {
        return pow(a, mod-2,mod);
    } return pow(a, mod-2,mod); pow(a, mod-2,mod) pow a mod-2 mod 2 mod long a a long mod mod public static long mul(long a,long b,long mod){
        long res=0;
        while(b!=0){
            if ((b & 1) == 1){ res = (res + a) % mod;}
            a = (a + a) % mod;
            b >>= 1;
        }
        return res;
    } mul {
        long res=0;
        while(b!=0){
            if ((b & 1) == 1){ res = (res + a) % mod;}
            a = (a + a) % mod;
            b >>= 1;
        }
        return res;
    } long res=0; res 0 while(b!=0){
            if ((b & 1) == 1){ res = (res + a) % mod;}
            a = (a + a) % mod;
            b >>= 1;
        } b!=0 b 0 {
            if ((b & 1) == 1){ res = (res + a) % mod;}
            a = (a + a) % mod;
            b >>= 1;
        } if ((b & 1) == 1){ res = (res + a) % mod;} (b & 1) == 1 (b & 1) b 1 1 { res = (res + a) % mod;} res = (res + a) % mod res (res + a) % mod (res + a) res a mod a = (a + a) % mod a (a + a) % mod (a + a) a a mod b >>= 1 b 1 return res; res long a a long b b long mod mod public static long pow(long a, long n, long mod){
        long res=1;
        while(n != 0){
            if ((n & 1) == 1) res = mul(res, a, mod)%mod;
            a = mul(a , a, mod)%mod;
            n >>= 1;
        }
        return res;
    } pow {
        long res=1;
        while(n != 0){
            if ((n & 1) == 1) res = mul(res, a, mod)%mod;
            a = mul(a , a, mod)%mod;
            n >>= 1;
        }
        return res;
    } long res=1; res 1 while(n != 0){
            if ((n & 1) == 1) res = mul(res, a, mod)%mod;
            a = mul(a , a, mod)%mod;
            n >>= 1;
        } n != 0 n 0 {
            if ((n & 1) == 1) res = mul(res, a, mod)%mod;
            a = mul(a , a, mod)%mod;
            n >>= 1;
        } if ((n & 1) == 1) res = mul(res, a, mod)%mod; (n & 1) == 1 (n & 1) n 1 1 res = mul(res, a, mod)%mod res mul(res, a, mod)%mod mul(res, a, mod) mul res a mod mod a = mul(a , a, mod)%mod a mul(a , a, mod)%mod mul(a , a, mod) mul a a mod mod n >>= 1 n 1 return res; res long a a long n n long mod mod public static long gcd(long a, long b){
        if(a == 0) return b;
        return b == 0 ? a: gcd(b, a % b);
    } gcd {
        if(a == 0) return b;
        return b == 0 ? a: gcd(b, a % b);
    } if(a == 0) return b; a == 0 a 0 return b; b return b == 0 ? a: gcd(b, a % b); b == 0 ? a: gcd(b, a % b) b == 0 b 0 a gcd(b, a % b) gcd b a % b a b long a a long b b 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()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 
    } 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 long nextLong() 
        { 
            return Long.parseLong(next()); 
        } nextLong { 
            return Long.parseLong(next()); 
        } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long 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 String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } nextLine { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } String str = ""; str "" try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } catch (IOException e) 
            { 
                e.printStackTrace(); 
            } IOException e { 
                e.printStackTrace(); 
            } e.printStackTrace() e.printStackTrace e { 
                str = br.readLine(); 
            } str = br.readLine() str br.readLine() br.readLine br return str; str public class Main{

    static long M=(long)1e9+7;
    public static void main(String[] args) {
        FastReader fs=new FastReader();
        long h=fs.nextLong();
        long count=0;
        long i=1;
        while(h!=1){
            h/=2;
            count+=i;
            i<<=1;
        }
        count+=i;
        System.out.println(count);
    }
    
    public static long min(long a, long mod){
        return pow(a, mod-2,mod);
    }
    public static long mul(long a,long b,long mod){
        long res=0;
        while(b!=0){
            if ((b & 1) == 1){ res = (res + a) % mod;}
            a = (a + a) % mod;
            b >>= 1;
        }
        return res;
    }
    
    public static long pow(long a, long n, long mod){
        long res=1;
        while(n != 0){
            if ((n & 1) == 1) res = mul(res, a, mod)%mod;
            a = mul(a , a, mod)%mod;
            n >>= 1;
        }
        return res;
    }
    
    public static long gcd(long a, long b){
        if(a == 0) return b;
        return b == 0 ? a: gcd(b, a % b);
    }

    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()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 
    }
} public class Main{

    static long M=(long)1e9+7;
    public static void main(String[] args) {
        FastReader fs=new FastReader();
        long h=fs.nextLong();
        long count=0;
        long i=1;
        while(h!=1){
            h/=2;
            count+=i;
            i<<=1;
        }
        count+=i;
        System.out.println(count);
    }
    
    public static long min(long a, long mod){
        return pow(a, mod-2,mod);
    }
    public static long mul(long a,long b,long mod){
        long res=0;
        while(b!=0){
            if ((b & 1) == 1){ res = (res + a) % mod;}
            a = (a + a) % mod;
            b >>= 1;
        }
        return res;
    }
    
    public static long pow(long a, long n, long mod){
        long res=1;
        while(n != 0){
            if ((n & 1) == 1) res = mul(res, a, mod)%mod;
            a = mul(a , a, mod)%mod;
            n >>= 1;
        }
        return res;
    }
    
    public static long gcd(long a, long b){
        if(a == 0) return b;
        return b == 0 ? a: gcd(b, a % b);
    }

    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()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 
    }
} Main
import java.io.*;
import java.util.*;
import java.math.*;
public class Main{

    static long M=(long)1e9+7;
    public static void main(String[] args) {
        FastReader fs=new FastReader();
        long h=fs.nextLong();
        long count=0;
        long i=1;
        while(h!=1){
            h/=2;
            count+=i;
            i<<=1;
        }
        count+=i;
        System.out.println(count);
    }
    
    public static long min(long a, long mod){
        return pow(a, mod-2,mod);
    }
    public static long mul(long a,long b,long mod){
        long res=0;
        while(b!=0){
            if ((b & 1) == 1){ res = (res + a) % mod;}
            a = (a + a) % mod;
            b >>= 1;
        }
        return res;
    }
    
    public static long pow(long a, long n, long mod){
        long res=1;
        while(n != 0){
            if ((n & 1) == 1) res = mul(res, a, mod)%mod;
            a = mul(a , a, mod)%mod;
            n >>= 1;
        }
        return res;
    }
    
    public static long gcd(long a, long b){
        if(a == 0) return b;
        return b == 0 ? a: gcd(b, a % b);
    }

    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()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 
    }
}
