import java.util.Scanner

object Main extends App {
  val sc = new Scanner(System.in)

  def solve(k: Int, pn: Array[Int]): Int = {
    val maxPoint = pn.max + 1
    var tmp = 0
    for(i <- (0 to maxPoint).reverse) {
      val cnt = pn.count(_ >= i)
      if(cnt <= k) {
        tmp = cnt
      } else {
        return tmp
      }
    }
    tmp
  }

  val n = sc.nextInt
  val k = sc.nextInt
  val pn = Array.fill(n)(sc.nextInt)
  println(solve(k, pn))
}