TheBeet有一片小花园，这个花园非常小，只有长宽都是1米。同时TheBeet又是出了名的懒，他从来不给这片花园里面的花浇水。当然，为了保证花的存活，TheBeet在花园中安装了几个小型自动喷灌系统，每个喷灌系统都能为其周围范围r内的花浇水。现在问题来了，TheBeet想知道他的花园中有多少地方是适合种植的——即至少有一个喷灌系统能覆盖到。-TheBeet have a small garden, the garden is very small, only the length and width are 1 m. At the same time TheBeet out of its lazy, he never gave this garden inside the flowers watered. Of course, in order to ensure the survival of flowers, TheBeet in the garden to install a few small automatic sprinkler system, each sprinkler systems are within its range r around watering the flowers. The question now to TheBeet would like to know there are many places in the garden is suitable for cultivation- that is, at least have a sprinkler system to cover.