package AssociativeArraysExercise;

import java.util.*;

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

        int n = Integer.parseInt(scanner.nextLine());
        Map<String, Double> students = new LinkedHashMap<>();
        Map<String, Integer> numberOfGrades = new LinkedHashMap<>();

        for (int i = 0; i < n; i++) {
            String name = scanner.nextLine();
            double grade = Double.parseDouble(scanner.nextLine());

            if (!students.containsKey(name)) {
                students.put(name, grade);
                numberOfGrades.put(name, 1);
            } else {
                students.put(name, students.get(name) + grade);
                numberOfGrades.put(name, numberOfGrades.get(name) + 1);
            }
        }
        Map<String, Double> result = new LinkedHashMap<>();
        for (String key : students.keySet()) {
            if (numberOfGrades.containsKey(key)) {
                result.put(key, students.get(key) / numberOfGrades.get(key));
            }
        }
        result.entrySet().stream()
                .filter(e -> e.getValue() >=4.50)
                .sorted(Map.Entry.comparingByValue(Comparator.reverseOrder()))
                .forEach(e -> System.out.println(String.format("%s -> %.2f",e.getKey(),e.getValue())));
    }
}