Problem:
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

Solution in JavaScript (node.js v5.12) (judge verdict: Runtime Error)

function Main(input){
  input = input.split("\n");
  inputStr = input[0].split(" ");
  var N = Number.parseInt(inputStr[0]);
  var A = [];
  var fst = 2;
  var snd = 1;
  var now = 0;
  //パラメータを配列に確保しつつ最大値と２番目の値を変数に格納
  for( i=0 ; i<N ; i++ ){
    inputStr = input[i+1].split(" ");
    now = Number.parseInt(inputStr[0]);
    A.push(now);
    if( fst =< now ){
      snd = fst;
      fst = now;
    } else if( snd =< now ){
      snd = now;
    }
  }
  //結果表示
  for( j = 0 ; j < N ; j++){
    if(A[j]===fst){
      console.log(snd);
    } else {
      console.log(fst);
    }
  }
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));