open System

let solve (a: int array) x =
  let count = a |> Array.countBy id
  let countKey = count |> Array.map fst
  let countMap = count |> Map.ofArray
  let pairNum key1 =
    let val1 = countMap.[key1]
    let key2 = x - key1
    Map.tryFind key2 countMap
    |> function
    | Some val2 -> val1 * val2
    | None -> 0
  countKey
  |> Array.map pairNum
  |> Array.sum

let R () = Console.ReadLine().Split() |> Array.map int

let N, X = 
  let t = R ()
  t.[0], t.[1]
let a = R()

solve a X
|> Console.WriteLine