import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

/**
 * メインクラス
 *
 */
public class Main {

	/**
	 * メインメソッド
	 * @param args
	 * @throws IOException
	 */
	public static void main(String[] args) throws IOException {

		// ============================================================
		// 標準入力を変数に設定
		// ============================================================

		// 標準入力を取得
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		long s = Integer.parseInt(br.readLine());

		List<Long> sums = new ArrayList<Long>();

		boolean ok = true;
		long i = 0;
		sums.add(s);
		while (ok) {

			i++;

			s = calc(s, i);

			if (sums.contains(s)) {
				System.out.println(i + 1);
				return;
			} else {
				sums.add(s);
			}

		}

	}

	static long calc(long num, long i) {

		if (num % 2 == 0) {
			return num / 2;

		} else {
			return num * 3 + 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