import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int S = sc.nextInt();
        int[] memo = new int[1000000];
        calc(S, 1, memo);
    }

    public static void calc(int s, int index, int[] memo) {
        
          if (s == 4 || s==2 || s==1) {
                System.out.println(index+3);
                return;
            }
       
		int result = 0;
        if (s % 2 == 0){
            result = s/2;
        }        
        else {
            result = s*3 + 1;
        }
        calc(result, index+1, memo);
    }
}
/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