There is a plane on which all points are initially white, except three red points and two blue points.
On each day, every line passing through a red point and a blue point is constructed. Then every white point, where two different such lines meet, turns blue.
Let
For example,
Find
现有一个二维平面,其上有三个红色的点、两个蓝色的点,其余的点都是白色的。
每一天中,我们作出每一条经过一个红点和一个蓝点的直线。若两条直线交于一个白色的点,那么这个点会变成蓝色。
记
求
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