import java.util.Scanner;

class Prog_3_1
{
	public static void main(String[] args)
	{

			Scanner input = new Scanner(System.in);
			double radius, area;

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

			area = 3.14 * radius * radius;

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