import java.util.*;
public class Circle
{
    public static void main (String [] args)
    {
        Scanner input = new Scanner(System.in);
        double phi = 3.14;
        double r, area, circumference;

        System.out.println("Calculate Area of a Circle\n");
        System.out.println("Please input the radius : ");
        r = input.nextDouble();

        area = 0.5*phi*r*r;
        circumference = 2*phi*r;

        System.out.println("The circle's area = "+area + "\nThe circle's circumference = "+circumference);
    }
}