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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()

    NUM = student_marks[query_name]
    NUM = float((NUM[0] + NUM[1] + NUM[2]) / 3)
    
    print("{:.2f}".format(NUM))