101340: [AtCoder]ABC134 A - Dodecagon
Memory Limit:256 MB
Time Limit:2 S
Judge Style:Text Compare
Creator:
Submit:0
Solved:0
Description
Score : $100$ points
Problem Statement
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 $r$.
Constraints
- $1 \leq r \leq 100$
- $r$ is an integer.
Input
Input is given from Standard Input in the following format:
$r$
Output
Print an integer representing the area of the regular dodecagon.
Sample Input 1
4
Sample Output 1
48
The area of the regular dodecagon is $3 \times 4^2 = 48$.
Sample Input 2
15
Sample Output 2
675
Sample Input 3
80
Sample Output 3
19200