l = []
a = input()
n = int(a)
l.append(n)

while True:
    if n % 2 == 0:
        n = n / 2
        l.append(n)
        continue
    elif n % 2 == 1:
        if n == 1:
            break
        else:
            n = 3 * n + 1
            l.append(n)
            continue

i = len(l) - 1
nm = max(l)