import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int s = sc.nextInt();
        int N = 1000000;
        int[] a = new int[N];
        a[0] = s;

        loop:for(int i=1; i<N; i++){
            if(a[i-1]%2==0){
                a[i] = a[i-1] / 2;
            }
            else if(a[i-1]%2!=0){
                a[i] = 3 * a[i - 1] + 1;
            }
            for(int j=0; j<i; j++){
                if(a[j]==a[i]){
                    System.out.println(i + 1);
                    break loop;
                }
            }
        }

    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz