Student Academy

dictionary = {}

count = int(input())

for _ in range(count):
    student_name = input()
    grade = float(input())

    if student_name not in dictionary:
        dictionary[student_name] = []
    dictionary[student_name].append(grade)

for student, grade in dictionary.items():
    if sum(grade) / len(grade) >= 4.50:
        average_grade = sum(grade) / len(grade)
        print(f"{student} -> {average_grade:.2f}")