import java.text.DecimalFormat;
import java.util.Scanner;
class CircleValue
{
	public static void main(String[] args)
	{
		DecimalFormat f = new DecimalFormat("0.000");
		Scanner input = new Scanner(System.in);
		double radius, area;

		System.out.print("Please input radius: ");
		radius = input.nextDouble();

		//System.out.println("The radius is: " + radius);

		area = Math.PI * radius * radius;

		System.out.println("The area is " + f.format(area));

		System.out.println("\n\nDone.\n\n");
	}
}