import java.util.*;
import java.io.*;
/**
 * Write a description of class CarTest here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
public class CarTest
{
    public static double startKM;
    public static double endKM;
    public static double litre;
    public static double kpl;
    /**
     * Initialization Section.
     */
    public static void main(String[] args)
    {
        double a = 0;
        Scanner sc = new Scanner(System.in);
        Car[] car = new Car[9];
        for (int i = 0; i< car.length; i++)
        {
            car[i] = new Car();
        }
        String info = "";
        System.out.println ("Enter car number");
        String temp = sc.nextLine();

        int carNum = Integer.parseInt(temp);
        int startLine = 3*carNum;
        int endLine = (3*carNum)+2;
        try
        {
            BufferedReader in = new BufferedReader(new FileReader("data.txt"));
            double line;
            int counter = 0;
            double[] lineNum = new double[3];
            for (int i = 0; i < startLine; i++) { info = in.readLine(); }

            for (int i = startLine; i < endLine + 1; i++) {
                line = Double.parseDouble(in.readLine());
                lineNum[counter] = line;
                counter = counter + 1;
            }
            in.close();
            startKM = lineNum[0];
            endKM = lineNum[1];
            litre = lineNum[2];
            kpl = (endKM - startKM) / litre;
        }
        catch (IOException ex)
        {
            System.out.println ("IOException error");
        }
        catch (NumberFormatException ex)
        {
            System.out.println ("NumberFormatException error");
        }

        System.out.println ("The kpl is " + kpl);
    }  // end of method double CalculateKPL(int carNum)
} // end of class CarTest