import java.io.PrintWriter;
import java.util.Scanner;

class Caravan {
    int totalMiles;
    double totalGalsUsed;
    java.util.ArrayList<Car> myCars;

    Caravan() {
        this.totalMiles = 0;
        this.totalGalsUsed = 0.0;
        this.myCars = new java.util.ArrayList<Car>();
    }

    void add(Car c) {
        if (c.getYearsOld() < 20) {
            this.myCars.add(c);
        }
    }

    public String toString() {
        String retval = "This is a caravan that has traveled " +
            this.totalMiles + " miles (and used " + this.totalGalsUsed +
            " gallons of gas).\n";
        retval += "And it has these stellar vehicles:";
        for (int i=0; i<myCars.size(); i++) {
            retval += myCars.get(i) + "\n";
        }
        return retval;
    }

    Caravan(Scanner s) {
        this.myCars = new java.util.ArrayList<Car>();
        s.nextLine();   // throw away "Road trip!!"
        this.totalMiles = Integer.parseInt(s.nextLine()); 
        this.totalGalsUsed = Double.parseDouble(s.nextLine()); 

        try {
            while (true) {
                Car newCar = new Car(s);
                this.myCars.add(newCar);
            }
        } catch (Exception e) {
        }
    }

    void persist(PrintWriter pw) {
        pw.println("Road trip!!");
        pw.println(this.totalMiles);
        pw.println(this.totalGalsUsed);
        for (int i=0; i<this.myCars.size(); i++) {
            myCars.get(i).persist(pw);
        }
        pw.println("That's all the cars!");
    }
}