URI 1002 - Área do Círculo - java

import java.io.IOException;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) throws IOException {
    Scanner scan = new Scanner(System.in);
    double a = scan.nextDouble();
    double b = 3.14159 * Math.pow(a, 2);

        System.out.printf("A=%.4f%n" , b);
        scan.close();
    }

}