10725: ABC134 - A - Dodecagon
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Description
It is known that the area of a regular dodecagon inscribed in a circle of radius $a$ is $3a^2$.
Given an integer $r$, find the area of a regular dodecagon inscribed in a circle of radius $r$.
Given an integer $r$, find the area of a regular dodecagon inscribed in a circle of radius $r$.
Input
Input is given from Standard Input in the following format:
```
$r$
```
```
$r$
```
Output
Print an integer representing the area of the regular dodecagon.
Constraints
- $1 \leq r \leq 100$
- $r$ is an integer.
- $r$ is an integer.
Sample 1 Input
4
Sample 1 Output
48
The area of the regular dodecagon is $3 \times 4^2 = 48$.
Sample 2 Input
15
Sample 2 Output
675
Sample 3 Input
80
Sample 3 Output
19200