import java.util.*;

class Main{
  public static void main(String args[]){
  	Scanner sc = new Scanner(System.in);
    int s = sc.nextInt();
    int flag = 0;
    int[] a = new int[1000000];
	int answer = 1;
	a[s]++;
    while(flag == 0){
      if(s%2 == 0){
        s = s/2;
      }else{
        s = s*3+1;
      }
      a[s]++;
	  answer++;
      if(a[s] == 2){
        flag = 1;
      }
    }
    System.out.print(answer);
  }
}

/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