import scala.collection.mutable
import scala.io.StdIn.*
import scala.math.{min, max}
@main def main =
  val n = readLine().toInt
  val a = readLine().split(' ').map(_.toInt)
  if n == 1 then
    println(a.head)
  else if n % 2 == 1 then
    println(1)
  else if n == 2 then
    println(a.foldLeft(1L)(_ * _))
  else
    val sorted = a.sorted
    val minA = sorted(0).toLong * sorted(1)
    val minB = sorted(2)
    println(min(minA, minB))