x, y, h = map(int, input().split())

x *= 1000
y *= 1000

calced = set()
q = [(x, y, h, 0)]
result = 0
while q:
    x, y, h, r = q.pop()
    if r > result:
        result = r
    if x > h and (x // 2, h) not in calced:
        calced.add((x // 2, h))
        q.append((x // 2, y, h * 2, r + 1))
    if y > h and (x, h // 2) not in calced:
        calced.add((x, h // 2))
        q.append((x, y // 2, h * 2, r + 1))
print(result)