def dfs(x, y, h):
    res = 0
    if(x > h):
        res = max(res, dfs(x, y*2, h*4) + 1)
    if(y > h):
        res = max(res, dfs(x*2, y, h*4) + 1)
    return res


x,y,h = map(int, input().split())
x *= 1000
y *= 1000
print(dfs(x,y,h))