/*
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 * and open the template in the editor.
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/**
 *
 * @author Caleb Bryson, Alexander Haag
 */
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.math.BigInteger;
import java.util.Scanner;
public class Collatz {
    
    
    public static void main(String[] args) throws FileNotFoundException {
        Scanner in = new Scanner(new File("collatz.in"));
        PrintWriter out = new PrintWriter(new File("collatz.out"));
       
        while(in.hasNext()){
            out.println(collatz(in.nextBigInteger()));
        }
        out.close();
    }
    public static int collatz(BigInteger input) {
        BigInteger[] array = new BigInteger[3000];
        
        int i = 0;
        array[i] = input;
        while (!array[i].equals(BigInteger.ONE)) {
            
            if (array[i].mod(BigInteger.valueOf(2)).equals(BigInteger.ZERO)) {
                BigInteger k = array[i].divide(BigInteger.valueOf(2));
                array[i+1] = k;
                i++;
            }else{
                BigInteger j = array[i].multiply(BigInteger.valueOf(3)).add(BigInteger.ONE);
                array[i+1] = j;
                i++;
            }
            
        }
        return i;
    }
}