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    if name == 'main': n = int(input()) student_marks = {} for _ in range(n): name, *line = input().split() scores = list(map(float, line)) student_marks[name] = scores query_name = input()

    if query_name in student_marks:
        average = sum(student_marks[query_name])/ len(student_marks[query_name])
    

    print(f"{average:.2f}")