import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.HashSet;
import java.util.StringTokenizer;

public class Main {

	static class Task {
        public void solve(InputReader in, PrintWriter out) {
        	int s = in.nextInt();
        	
        	HashSet<Integer> set = new HashSet<Integer>();
        	
        	int next = s;
        	int i=1;
        	do {
        		set.add(next);
        		if(next%2==1)
        			next = next*3+1;
        		else
        			next = next/2;
        		i++;
        	}
        	while(!set.contains(next));
        	out.println(i);
        }
    }
	
    public static void main(String argds[]) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task solver = new Task();
        solver.solve(in, out);
        out.close();
    }

	static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;
        
        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }
        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }
 
        public int nextInt() {
            return Integer.parseInt(next());
        }
 
        public long nextLong() {
            return Long.parseLong(next());
        }
    }	
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.OutputStream; OutputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.HashSet; HashSet java.util import java.util.StringTokenizer; StringTokenizer java.util public class Main {

	static class Task {
        public void solve(InputReader in, PrintWriter out) {
        	int s = in.nextInt();
        	
        	HashSet<Integer> set = new HashSet<Integer>();
        	
        	int next = s;
        	int i=1;
        	do {
        		set.add(next);
        		if(next%2==1)
        			next = next*3+1;
        		else
        			next = next/2;
        		i++;
        	}
        	while(!set.contains(next));
        	out.println(i);
        }
    }
	
    public static void main(String argds[]) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task solver = new Task();
        solver.solve(in, out);
        out.close();
    }

	static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;
        
        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }
        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }
 
        public int nextInt() {
            return Integer.parseInt(next());
        }
 
        public long nextLong() {
            return Long.parseLong(next());
        }
    }	
} Main public static void main(String argds[]) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task solver = new Task();
        solver.solve(in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task solver = new Task();
        solver.solve(in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out InputReader in = new InputReader(inputStream); in new InputReader(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) Task solver = new Task(); solver new Task() solver.solve(in, out) solver.solve solver in out out.close() out.close out String argds[] argds static class Task {
        public void solve(InputReader in, PrintWriter out) {
        	int s = in.nextInt();
        	
        	HashSet<Integer> set = new HashSet<Integer>();
        	
        	int next = s;
        	int i=1;
        	do {
        		set.add(next);
        		if(next%2==1)
        			next = next*3+1;
        		else
        			next = next/2;
        		i++;
        	}
        	while(!set.contains(next));
        	out.println(i);
        }
    } Task public void solve(InputReader in, PrintWriter out) {
        	int s = in.nextInt();
        	
        	HashSet<Integer> set = new HashSet<Integer>();
        	
        	int next = s;
        	int i=1;
        	do {
        		set.add(next);
        		if(next%2==1)
        			next = next*3+1;
        		else
        			next = next/2;
        		i++;
        	}
        	while(!set.contains(next));
        	out.println(i);
        } solve {
        	int s = in.nextInt();
        	
        	HashSet<Integer> set = new HashSet<Integer>();
        	
        	int next = s;
        	int i=1;
        	do {
        		set.add(next);
        		if(next%2==1)
        			next = next*3+1;
        		else
        			next = next/2;
        		i++;
        	}
        	while(!set.contains(next));
        	out.println(i);
        } int s = in.nextInt(); s in.nextInt() in.nextInt in HashSet<Integer> set = new HashSet<Integer>(); set new HashSet<Integer>() int next = s; next s int i=1; i 1 do {
        		set.add(next);
        		if(next%2==1)
        			next = next*3+1;
        		else
        			next = next/2;
        		i++;
        	}
        	while(!set.contains(next)); !set.contains(next) set.contains(next) set.contains set next {
        		set.add(next);
        		if(next%2==1)
        			next = next*3+1;
        		else
        			next = next/2;
        		i++;
        	} set.add(next) set.add set next if(next%2==1)
        			next = next*3+1;
        		else
        			next = next/2; next%2==1 next%2 next 2 1 next = next*3+1 next next*3+1 next*3 next 3 1 next = next/2 next next/2 next 2 i++ i out.println(i) out.println out i InputReader in in PrintWriter out out static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;
        
        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }
        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }
 
        public int nextInt() {
            return Integer.parseInt(next());
        }
 
        public long nextLong() {
            return Long.parseLong(next());
        }
    } InputReader public BufferedReader reader; reader public StringTokenizer tokenizer; tokenizer public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        } InputReader {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        } reader = new BufferedReader(new InputStreamReader(stream), 32768) reader new BufferedReader(new InputStreamReader(stream), 32768) tokenizer = null tokenizer null InputStream stream stream public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        } next {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        } while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            } tokenizer == null || !tokenizer.hasMoreTokens() tokenizer == null tokenizer null !tokenizer.hasMoreTokens() tokenizer.hasMoreTokens() tokenizer.hasMoreTokens tokenizer {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            } try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                } catch (IOException e) {
                    throw new RuntimeException(e);
                } IOException e {
                    throw new RuntimeException(e);
                } throw new RuntimeException(e); new RuntimeException(e) {
                    tokenizer = new StringTokenizer(reader.readLine());
                } tokenizer = new StringTokenizer(reader.readLine()) tokenizer new StringTokenizer(reader.readLine()) return tokenizer.nextToken(); tokenizer.nextToken() tokenizer.nextToken tokenizer public int nextInt() {
            return Integer.parseInt(next());
        } nextInt {
            return Integer.parseInt(next());
        } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next public 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 Task {
        public void solve(InputReader in, PrintWriter out) {
        	int s = in.nextInt();
        	
        	HashSet<Integer> set = new HashSet<Integer>();
        	
        	int next = s;
        	int i=1;
        	do {
        		set.add(next);
        		if(next%2==1)
        			next = next*3+1;
        		else
        			next = next/2;
        		i++;
        	}
        	while(!set.contains(next));
        	out.println(i);
        }
    }
	
    public static void main(String argds[]) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task solver = new Task();
        solver.solve(in, out);
        out.close();
    }

	static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;
        
        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }
        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }
 
        public int nextInt() {
            return Integer.parseInt(next());
        }
 
        public long nextLong() {
            return Long.parseLong(next());
        }
    }	
} public class Main {

	static class Task {
        public void solve(InputReader in, PrintWriter out) {
        	int s = in.nextInt();
        	
        	HashSet<Integer> set = new HashSet<Integer>();
        	
        	int next = s;
        	int i=1;
        	do {
        		set.add(next);
        		if(next%2==1)
        			next = next*3+1;
        		else
        			next = next/2;
        		i++;
        	}
        	while(!set.contains(next));
        	out.println(i);
        }
    }
	
    public static void main(String argds[]) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task solver = new Task();
        solver.solve(in, out);
        out.close();
    }

	static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;
        
        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }
        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }
 
        public int nextInt() {
            return Integer.parseInt(next());
        }
 
        public long nextLong() {
            return Long.parseLong(next());
        }
    }	
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.HashSet;
import java.util.StringTokenizer;

public class Main {

	static class Task {
        public void solve(InputReader in, PrintWriter out) {
        	int s = in.nextInt();
        	
        	HashSet<Integer> set = new HashSet<Integer>();
        	
        	int next = s;
        	int i=1;
        	do {
        		set.add(next);
        		if(next%2==1)
        			next = next*3+1;
        		else
        			next = next/2;
        		i++;
        	}
        	while(!set.contains(next));
        	out.println(i);
        }
    }
	
    public static void main(String argds[]) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task solver = new Task();
        solver.solve(in, out);
        out.close();
    }

	static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;
        
        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }
        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }
 
        public int nextInt() {
            return Integer.parseInt(next());
        }
 
        public long nextLong() {
            return Long.parseLong(next());
        }
    }	
}