Ski Trip

import java.util.Scanner;

public class SkiTrip {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int days = Integer.parseInt(scanner.nextLine());
        String room = scanner.nextLine();
        String grade = scanner.nextLine();

        double price = 0;
        int nights = days - 1;

        if ("room for one person".equals(room)) {

            price = nights * 18; // трябва да умножим по броя на нощувките
        } else if ("apartment".equals(room)) {
            if (nights < 10) {
                price = nights * 25 * 0.7; // или: price = nights * 25; price -= price* 0.3;
            }
            if (nights >= 10 && days <= 15) {
                price = nights * 25 * 0.65; // или: price = nights * 25; price -= price* 0.35;
            }
            if (nights > 15) {
                price = nights * 25 * 0.5; // или: price = nights * 25; price -= price* 0.5;
            }
        } else if ("president apartment".equals(room)) { // Тук трябва да затворим горния else if
                if (nights < 10) {
                    price = nights * 35 * 0.9; // или: price = nights * 35; price -= price* 0.1;
                }
                if (nights >= 10 && days <= 15) {
                    price = nights * 35 * 0.85; // или: price = nights * 35; price -= price* 0.15;
                }
                if (nights > 15) {
                    price = nights * 35 * 0.8; // или: price = nights * 35; price -= price* 0.2;
                }
            }
            if ("positive".equals(grade)){
                System.out.printf("%.2f", price * 1.25); // или: System.out.printf("%.2f", price + price* 0.25);
            }else if ("negative".equals(grade)){
                System.out.printf("%.2f", price * 0.9); //  или: System.out.printf("%.2f", price - price* 0.1);
            }
        //} Тук свършваше else if ("apartment".equals(room))
    }
}