import java.util.Scanner;



public class Circle {


    public static void main(String[] args) {



        Scanner input = new Scanner(System.in);
        System.out.println("Enter Radius");
        double number = input.nextDouble();
        double area = number*number*Math.PI;
        System.out.printf("The circle with the radius of %f has area of: %.2f", number, area );



    }

}