import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    int s = Integer.parseInt(in.readLine());
    int[] ary = new int[1000000];
    boolean roopFlg = false;
    for(int i=0; ; i++) {
      ary[i] = s;
      if(s%2==0)
        s=s/2;
      else
        s=3*s+1;
      for(int j=0; j<i; j++) {
        if(ary[i]==ary[j]) {
          System.out.println(i+1);
          roopFlg = true;
          break;
        }
      }
      if(roopFlg == true)
        break;
    }
  }
}
/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