import scala.annotation.tailrec
import scala.io.StdIn.*
import scala.math.max
@main def main =
  val n = readLine().toInt
  val students = Array.fill(n){
    readLine().split(' ').map(_.toLong)
  }
  val maxScore = Array.tabulate(1 << 6) { pattern =>
    val subject = (0 until 6).filter { i => ((pattern >> i) & 1) == 1 }
    students.map { score => subject.map(score).product }.max
  }
  var result = 0L
  for patternN <- 0 until (1 << 12) do
    val pattern = Array.tabulate(4){i =>
      (0 until 6).map{j => if ((patternN >> (2 * j)) & 3) == i then 1 << j else 0}.sum
    }
    val current = pattern.map(maxScore).product
    result = max(result, current)
  println(result)