import java.util.Scanner;
//=================================================================================================
public class UseNuclearException {
//-------------------------------------------------------------------------------------------------
    private static final Scanner keyboard = new Scanner(System.in);
    private static final double CRITICAL_MASS = 13;
//---Kg, for reactor-grade plutonium
//-------------------------------------------------------------------------------------------------
    public static void main(String[] args) {

        double mass;

        System.out.print("How much plutonium do you have : ");
        mass = keyboard.nextDouble();
        try {
            shootPlutonium(mass);
            System.out.println("Whew, that was scary, but we lived");
        } catch (NuclearException e) {
            System.out.println(e.getMessage());
        }

    }
//-------------------------------------------------------------------------------------------------
    private static void shootPlutonium(double mass) throws NuclearException {

        if (mass >= CRITICAL_MASS) {
            throw(new NuclearException(mass));
        }

        System.out.println("Shot fired");
    }
//-------------------------------------------------------------------------------------------------
}
//=================================================================================================