# coding: utf-8
# AtCoder Competition Template v2.1 SHORT (PyPy 7.3.20 / Python 3.11)　※yukicoder用に編集した物
# ↑ https://github.com/Rino-program/atcoder/blob/main/contests/.template/main.py
# oj test -c 'C:\Rino-program\AtCoder\.venv-pypy311\Scripts\python.exe maina.py' -d input/a

import sys
import math

# ===== 入出力ヘルパ =====
def input() -> str:
    return sys.stdin.readline().rstrip()

def INT() -> int:
    return int(input())

def MAP():
    return map(int, input().split())

def LIST() -> list[int]:
    return list(MAP())

def TUPLE() -> tuple[int, ...]:
    return tuple(MAP())

def TUPLES(n: int) -> list[tuple[int, ...]]:
    return [TUPLE() for _ in range(n)]

# ===== 定数 =====
INF = 10 ** 18

# ===== 関数短縮 =====
pr = print
en = enumerate

# ===== よく使う出力関数 =====
def Yes(): print("Yes")
def No(): print("No")
def yn(cond: bool) -> None:
    """条件に応じてYes/No出力"""
    print("Yes" if cond else "No")

# ===== デバッグ =====
def debug(*args, **kwargs) -> None:
    """デバッグ出力（標準エラー）"""
    print("[DEBUG]", *args, **kwargs, file=sys.stderr)

# ==============================================
# =================== main =====================
# ==============================================

def main() -> None:
    # ここに解答を書く
    # 答えは意外と小さそう
    N = INT()
    ans = 0
    while N != 1:
        ans += 1
        if N % 2:
            N *= 3
            N += 1
        else:
            N //= 2
    pr(ans)



















if __name__ == "__main__":
    main()