import itertools

n = int(input())
students = []
for _ in range(n):
    m, i, p, c, b, e = map(int, input().split())
    students.append((m, i, p, c, b, e))

subjects = [0, 1, 2, 3, 4, 5]  # M, I, P, C, B, E

candidates = set()

for subject in subjects:
    sorted_students = sorted(enumerate(students), key=lambda x: x[1][subject], reverse=True)
    top = min(5, len(sorted_students))
    for i in range(top):
        candidates.add(sorted_students[i][0])

candidates = list(candidates)
max_score = 0

for group in itertools.combinations(candidates, 4):
    max_values = [0] * 6
    for subject in subjects:
        max_val = 0
        for member in group:
            val = students[member][subject]
            if val > max_val:
                max_val = val
        max_values[subject] = max_val
    product = 1
    for val in max_values:
        product *= val
    if product > max_score:
        max_score = product

print(max_score)