import java.util.*;
class Main {
    public static void main(String[] args) {
        int[] a = new int[1000000];
        Scanner sc = new Scanner(System.in);
        a[0] = sc.nextInt();
        int m = 0;
        while(!(a[m]==4 || a[m]==2 || a[m]==1)) {
            if(a[m]%2 == 0) a[m+1] = a[m]/2;
            else a[m+1] = 3*a[m] + 1;
            m++;
        }
        System.out.println((m+1)+3);
    }
}
/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