NN and the Optical Illusion-光学幻觉 CodeForce1100C 几何
题目链接:NN and the Optical Illusion
题目原文
NN is an experienced internet user and that means he spends a lot of time on the social media. Once he found the following image on the Net, which asked him to compare the sizes of inner circles:

It turned out that the circles are equal. NN was very surprised by this fact, so he decided to create a similar picture himself.
He managed to calculate the number of outer circles
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