X,Y,H = map(int,input().split())
X *= 1000
Y *= 1000
from collections import deque

q = deque([(0,X,Y)])
ans = 0
while q:
    k,x,y = q.popleft()
    ans = max(ans, k)
    h = 2**k * H
    if x > h:
        q.append((k+1,x/2,y))
    if y > h:
        q.append((k+1,x,y/2))
print(ans)