Maximise the Rectangle

By Kay Akashi

Problem Statement

Given an integer $n$, you are asked to maximise the area of rectangle whose lengths of all $4$ edges add up to $n$. When printing the number, output $336$ multiplied by the maximised area and this should be a whole number.

Constraints

$0 \leq n \lt 500$.

Input

The input contains one line, which is $n$.

Output

Output $336$ multiplied by the maximum area of rectangle that consists of $4$ edges whose lengths add up to $n$. Output should be an integer.

Examples

7

1029

0

0