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);
}
}