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, List<Double>> register = new LinkedHashMap<>();

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

            List<Double> curr = register.get(name);
            if(curr == null){
                curr = new ArrayList<>();
                curr.add(grade);
                register.put(name,curr);
            }else{
                curr.add(grade);
                register.put(name, curr);
            }

        }

        register
                .entrySet()
                .stream()
                .filter(entry -> {
                    double asDouble = entry.getValue().stream().mapToDouble(x -> x).average().getAsDouble();
                    return asDouble>=4.50;

                })
                .sorted((a,b) ->{
                   return Double.compare(b.getValue().stream().mapToDouble(x -> x).average().getAsDouble(),a.getValue().stream().mapToDouble(x -> x).average().getAsDouble());
                })
                .forEach(x -> {
                    double asDouble = x.getValue().stream().mapToDouble(f -> f).average().getAsDouble();
                    System.out.printf("%s -> %.2f%n",x.getKey(),asDouble);
                });

    }
}