import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        int i = 0;
        while(n != 1) {
            if(n % 2 == 0) {
                n /= 2;
                i++;
            } else {
                n = n * 3 + 1;
                i++;
            }
        }
        System.out.println(i);
    }
}