from collections import deque, defaultdict
inf = 10**9

N = int(input())
dist = defaultdict(int)
dist[N] = 1
que = deque([N])
while que:
    s = que.popleft()
    ds = dist[s]
    if s == 1:
        break
    if s % 2 == 0:
        t = s // 2
        if not dist[t]:
            dist[t] = ds + 1
            que.append(t)
    if not dist[s + 1]:
        dist[s + 1] = ds + 1
        que.append(s + 1)

print(dist[1]-1)