n = int(input())

flag = True
li = [n]
i = 0
while flag:
    if li[i] == 1:
        print(i)
        flag = False
    if li[i] % 2 == 0:
        li.append(li[i]//2)
    else:
        li.append(3*li[i]+1)
    i += 1
print(max(li))