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total_students, columns = int(input()), input().split()
marks = sum(int(input().split()[columns.index('MARKS')]) for _ in range(total_students))
print(f"{marks / total_students:.2f}")
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Collections.namedtuple()
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total_students, columns = int(input()), input().split() marks = sum(int(input().split()[columns.index('MARKS')]) for _ in range(total_students)) print(f"{marks / total_students:.2f}")