01.Sea Trip

import java.util.Scanner;

public class SeaTrip_01 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double moneyForFoodPerDay = Double.parseDouble(scanner.nextLine());
        double moneyForSouvenirsPerDay = Double.parseDouble(scanner.nextLine());
        double moneyForHotelPerDay = Double.parseDouble(scanner.nextLine());

        int totalKm = 420; //2 * 210 km
        double litersFuel = totalKm / 100.0 * 7;
        double priceFuel = litersFuel * 1.85;

        double totalFoodSouvenirs = 3 * (moneyForFoodPerDay + moneyForSouvenirsPerDay);
        double priceHotelFirstDay = moneyForHotelPerDay - 0.10 * moneyForHotelPerDay; // 0.9 * moneyForHotelPerDay
        double priceHotelSecondDay = moneyForHotelPerDay - 0.15 * moneyForHotelPerDay; // 0.85 * moneyForHotelPerDay
        double priceHotelThirdDay = moneyForHotelPerDay - 0.20 * moneyForHotelPerDay; // 0.8 * moneyForHotelPerDay

        double totalSum = priceFuel + totalFoodSouvenirs + priceHotelFirstDay + priceHotelSecondDay + priceHotelThirdDay;
        System.out.printf("Money needed: %.2f", totalSum);
    }
}