import java.util.Scanner;
import java.io.PrintStream;

public class Collatz {
    public static void main(String[] args) {
	Scanner in = new Scanner(System.in );
	PrintStream out = System.out;

	int n = in.nextInt();
	while (n != 0) {
	    int steps = 0;
	    while (n != 1) {
		if (n%2 == 1) n = 3*n+1;
		else n=n/2;
		steps++;
	    }
	    out.println(steps);
	    n = in.nextInt();
	}
    }
}