import java.util.*;

class Main {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        String inputString = sc.nextLine();
        int s = Integer.valueOf(inputString);
        if(s==4 || s==2 || s==1 ) {
            System.out.println("4");
            return;
        }
        int lastNumber = s;
        int i = 2;
        while(true) {
            int thisNumber = function(lastNumber);
            if(thisNumber==4) {
                System.out.println(i+3);
                break;
            }
            lastNumber = thisNumber;
            i++;
        }
    }

    private static int function(int n) {
        if(n%2==0){
            return n/2;
        }else{
            return 3*n+1;
        }

    }

}
/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