px, py, ph = map(int, input().split())
px, py = 1000 * px, 1000 * py
ans = 0
for i in range(1 << 21):
    cnt = 0
    x, y, h = px, py, ph
    for j in range(21):
        if (i >> j) & 1:
            if x > h:
                cnt += 1
            else:
                break
            y *= 2
        else:
            if y > h:
                cnt += 1
            else:
                break
            x *= 2
        h *= 4
    ans = max(ans, cnt)
print(ans)