import scala.io.StdIn.*
import scala.math.min

@main def main =
  val Array(n, m) = readLine().split(' ').map(_.toInt)
  val ore = readLine().split(' ').map(_.toInt)
  var sum = 0L
  var minAverage = Long.MaxValue
  for i <- 0 until n do
    sum += ore(i)
    val average = (sum / (i + 1)) / m
    minAverage = min(average, minAverage)
  println(minAverage)