Java Advanced - SerbianUnleashed

import java.util.LinkedHashMap;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class SerbianUnleashed_v2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        LinkedHashMap<String, LinkedHashMap<String, Integer>> concerts = new LinkedHashMap<>();
        String regex = "^(?<singer>[\\w\\s]+)\\s@(?<venue>[\\w\\s]+)\\s(?<ticketPrice>\\d+)\\s(?<ticketCount>\\d+)$";
        String input = scanner.nextLine();
        while (!input.equals("End")) {

            Pattern pattern = Pattern.compile(regex);
            Matcher matcher = pattern.matcher(input);
            if (matcher.find()) {
                String place = matcher.group("venue");
                String singer = matcher.group("singer");
                int ticketPrice = Integer.parseInt(matcher.group("ticketPrice"));
                int ticketCount = Integer.parseInt(matcher.group("ticketCount"));
                int ticketSum = ticketCount * ticketPrice;
                concerts.putIfAbsent(place, new LinkedHashMap<>());
                concerts.get(place).putIfAbsent(singer, 0);
                concerts.get(place).put(singer, concerts.get(place).get(singer) + ticketSum);
            }
            input = scanner.nextLine();
        }

        concerts.forEach((key, value) -> {
            System.out.printf("%s%n", key);
            value.entrySet()
                    .stream()
                    .sorted((f, s) -> s.getValue().compareTo(f.getValue()))
                    .forEach(entry -> System.out.printf("#  %s -> %d%n", entry.getKey(), entry.getValue())
                    );
        });
    }
}