문제
누구나 다 아는 꿍텔레콤은 새로 건설된 고속도로에 꿍전파를 널리 퍼뜨리기 위해 여러 기지국들을 세우려고 했다. 하지만 언제나 어설픈 꿍은 발전소가 없다는 것을 뒤늦게 알아차렸다. 기지국마다 발전소를 만들수는 없으므로 단 하나의 발전소만을 만들어 기지국들에 전력을 공급해야 한다. 이때 발전소는 고속도로상에 지을 예정이며 고속도로상의 임의의 지점에서 가장 가까운 발전소까지의 거리를 d라고 했을 때 d의 값이 최대가 되는 곳에 지으려고 한다.
하지만 꿍은 언제나 어설프다. 이번에도 여러분의 도움이 필요하다.
출력
d값들 중 최대가 되는 값 단 하나를 출력하면 된다.
단, 소수점 아래 3자리까지의 정확도를 가져야한다.
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
