The circumscribed circle area of a positive triangle

Describe to you the side length of the triangle, pi=3.1415926, the circumscribed circle area of the triangle.

 

Input

only one set of test data the first line of input an integer n (1<n<1000) indicates the next to enter n edge length m (1.0<=m<1000.0)

Output

outputs the circumscribed circle area of each positive triangle, preserving two decimal places, each of which occupies a single row.

Sample input

51132262155

Sample output

1.05176.98506.844025.4325158.92

1 ImportJava.math.BigInteger;2 Importjava.util.Arrays;3 ImportJava.util.Scanner;4 5  Public classMain {6      Public Static voidMain (string[] args) {7Scanner scanner=NewScanner (system.in);8         intT;9         DoubleN;Ten         DoubleMianji; One         Doublepi=3.1415926;  A          -t=scanner.nextint (); -          while(true){ the             if(t==0) -                  Break; -t--; -              +n=scanner.nextdouble (); -Mianji=n*n*pi/3; +System.out.printf ("%.2f\n", Mianji); A         }      at     }  -}

The circumscribed circle area of a positive triangle