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import java.util.Scanner;
/**
 * Takes user input of the unit of sound
 * and value. Then prints a message
 */
public class SoundLevels
{
    public static void main(String[] args)
    {
        final double ReferenceSoundPressure = 20E-6;
        
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter type of sound unit: Pa or dB: ");
        String units = scan.nextLine();
        if (units.equals("Pa") || units.equals("dB"))
        {
            System.out.print("Enter the sound value: ");
            double value = scan.nextDouble();
            
            //convert Pa to dB if necessary
            // L = 20 log10 (p / p0)
            if (units.equals("Pa"))
            {
                value = 20 * Math.log10(value / ReferenceSoundPressure);
            }
            String message = "";
            if (value == 0)
            {
                message ="threshold of normal hearing";
            }
            else if (value == 60)
            {
                message = "no damage";
            }
            else if (value == 85)
            {
                message = "damage after 8 hours";
            }
            else if (value == 100)
            {
                message = "damage after 15 minutes a day";
            }
            else if (value >= 140 && value <= 190)
            {
                message = "immediate damage";
            }
            else if (value > 190)
            {
               message = "don't even think about it";
            }
            else
            {
                message = "I do not have that value";
            }
            System.out.println(message);
        }
        else
        {
            System.out.println("Enter correct correct units");
        }
    }
}