n =int(input())

dp = {}
dp[1] = 0
def answer(x):
  if not dp.get(x, None) is None:
    return dp[x]
  else:
    if x % 2 == 0:
      ans = answer(x // 2) + 1
    else:
      ans = answer(x + 1) + 1

    dp[x] = ans
    return ans

print(answer(n))