import java.util.*;

public class Main{

    public static void main(String args[]){

        //配列の宣言
        int[] num = new int[1000000];
        // スキャナーの宣言
        Scanner sc = new Scanner(System.in);
        // 整数の入力
		int s = sc.nextInt();

        int i = 0;
        while(true){
            i++;
            if(num[s-1] == 1){
                break;
            }else{
                num[s-1] = 1;
            }
            if(s % 2 == 0){
                s = s / 2;
            }else{
                s = 3 * s + 1;
            }
        }

        // 出力
        System.out.println(i);

    }

}
/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