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#11173. 矩形

الإحصائيات

Byteman 有 $n$ 个边长为 1 的正方形。他可以用这些正方形组成多少种不同的矩形?

如果两个矩形不能通过旋转和平移相互重合,则它们被视为不同的矩形。在构建矩形的过程中,Byteman 不能使正方形变形,也不能将任何正方形叠放在其他正方形上。

输入格式

标准输入的第一行也是唯一一行包含一个整数 $n$ ($1 \le n \le 10\,000$)。

输出格式

标准输出的第一行也是唯一一行应包含一个整数,表示 Byteman 可以用他的正方形组成的矩形总数。

样例

输入 1

6

输出 1

8

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