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

count = 0
while True:
    if x < y:
        if x > h/1000:
            x /= 2
            h *= 2
            count += 1
        else:
            if y > h/1000:
                y /= 2
                h *= 2
                count += 1
            else:
                break
    else:
        if y > h/1000:
            y /= 2
            h *= 2
            count += 1
        else:
            if x > h/1000:
                x /= 2
                h *= 2
                count += 1
            else:
                break
print(count)