from itertools import product
x,y,h = map(int, input().split())

dp = 0
for pro in product((0, 1), repeat=18):#0:横を折る、1:縦を折る
    a = x*1000
    b = y*1000
    c = h
    ans = 0
    for i in range(18):
        if pro[i]:
            if a >= c:
                a /=2
                c *=2
                ans+=1
            else:
                break
        else:
            if b >= c:
                b /=2
                c *=2
                ans+=1
            else:
                break
    dp = max(dp, ans)
print(dp)