number_of_students = int(input())
students = {}
# updated_students = {}

for information in range(number_of_students):
    student_name = input()
    student_grade = float(input())
    if student_name not in students:
        students[student_name] = [student_grade]
    else:
        students[student_name].append(student_grade)

for student, average_score in students.items():
    average = sum(average_score) / len(average_score)
    if average >= 4.50:
        print(f"{student} -> {average:.2f}")
#         updated_students[student] = f"{average:.2f}"
# for student, score in updated_students.items():
#     # print(f"{student} -> {score}")