import java.util.Scanner;
//=================================================================================================
public class JUnitPizzaCost {
//-------------------------------------------------------------------------------------------------
    private static Scanner keyboard = new Scanner(System.in);
//-------------------------------------------------------------------------------------------------
    public static void main(String[] args) {

//----Variables to hold cost, unit cost, diameter
        double cost;
        double diameter;
        double unitCost;

//----Get data
        System.out.print("What size pizza   : ");
        diameter = keyboard.nextDouble();
        System.out.print("What does it cost : ");
        cost = keyboard.nextDouble();

//----Perform computation
        unitCost = computeUnitCost(diameter,cost);

//----Display the diameter, the total cost, and the unit cost
        System.out.println("Diameter is   " + diameter);
        System.out.println("Total cost is " + cost);
        System.out.println("Unit cost is  " + unitCost);
    }
//-------------------------------------------------------------------------------------------------
    static double computeUnitCost(double diameter,double cost) {

        double area;
        double unitCost;

        unitCost = cost / computeArea(diameter);

        return(unitCost);
    }
//-------------------------------------------------------------------------------------------------
    static double computeArea(double diameter) {

        double radius;

        radius = diameter / 2;
        return(Math.PI * radius * radius);
    }
//-------------------------------------------------------------------------------------------------
}
//=================================================================================================