fun main(args:Array<String>) {
  val (n, x) = readLine()!!.split(" ").map(String::toInt)
  val xs = readLine()!!.split(" ").map(String::toInt)
  val freq = xs.groupBy { it }.map { (k,vs) -> Pair(k, vs.size) }.toMap()
  val sets = xs.toSet()
  val keys = mutableListOf<Pair<Int,Int>>()
  for( s in sets.toList() ) {
    if( sets.contains(x-s) ) keys.add( Pair(s, x-s) )
  }
  keys.toList().map { (k, v) ->
   freq[k]!!*freq[v]!!
  }.sum().run(::println)
}