import sys
# input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################


def f(n):
    if n == 1:
        return 3
    x = n
    ans = 0
    while x > 1:
        if x % 2 == 0:
            x //= 2
        else:
            x = x * 3 + 1
        ans += 1
    return ans

print(f(ni()))
# print(f(27))
# # for n in range(1, 3001):
# #     print(n, f(n))