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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()

    for i in student_marks: if i == query_name: counter = len(student_marks[i]) summy = sum(student_marks[i]) print("{:.2f}".format(summy/counter))