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i = int(input())
marks = 0
index = input().split().index("MARKS")
for x in range(i):
row = input().split()
marks = marks + int(row[index])
print(marks/i)
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Collections.namedtuple()
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i = int(input())
marks = 0 index = input().split().index("MARKS") for x in range(i): row = input().split() marks = marks + int(row[index]) print(marks/i)