import java.util.Scanner;
public class Application
{
    public static void main(String[] arguments) {
        Float a;
        Scanner input;

        input = new Scanner(System.in);

        System.out.print("Input radius: ");
        a = input.nextFloat();
        System.out.println("The diameter is " + 2*a + ".");
        System.out.println("The circumference is " + 2*a*Math.PI + ".");
        System.out.println("The diameter is " + Math.PI*a*a + ".");
    }
}