import sequtils,strutils,algorithm,math
import tables
proc getchar_unlocked():char {. importc:"getchar_unlocked",header: "<stdio.h>" .}
proc scan(): int =
  while true:
    var k = getchar_unlocked()
    if k < '0' or k > '9': break
    else: result = 10 * result + k.ord - '0'.ord
proc toCountSeq[T](x:seq[T]) : seq[tuple[k:T,v:int]] = toSeq(x.toCountTable().pairs)

let n = scan()
let x = scan()
var A = newSeq[int](n)
for i in 0..<n:A[i] = scan()
let KV = A.toCountSeq().sorted(cmp)
let K = KV.mapIt(it.k)
let V = KV.mapIt(it.v)
var ans = 0
for ik,k in K:
  let i = K.lowerBound(x-k)
  if K[i] + k == x : ans += V[i]*V[ik]
echo ans