import scala.io.StdIn

object Solution {
    def main(args: Array[String]): Unit = {

        def getArrayFromUI(current: Array[Array[Int]], remainTime: Int): Array[Array[Int]] = {
            if (remainTime == 0) current
            else {
                val x = StdIn.readLine().split(" ").map(_.toInt)
                getArrayFromUI(current :+ x, remainTime-1)
            }
        }

        def multiply(arrayA: Array[Array[Int]], arrayB: Array[Array[Int]]) =
            (for {
                zipped <- arrayA.zip(arrayB)
                (t1, t2) <- zipped._1.zip(zipped._2)
            } yield {
                t1 * t2
            }).sum


        val arrayA = getArrayFromUI(Array(), 6)
        val hourGlass = Array(Array(1, 1, 1), Array(0, 1, 0), Array(1, 1, 1))
        val steps = arrayA.length - hourGlass.length + 1

        val results = for {
            i <- (0 until steps).toArray
            j <- (0 until steps).toArray
        } yield {
            val a = arrayA.slice(i, i + 3).map(_.slice(j, j + 3))
            multiply(a, hourGlass)
        }

        println(results.max)
    }
}