#include <bits/stdc++.h>
#include <string>
#define ft first
#define sc second
#define pt(sth) cout << sth << "\n"
#define chmax(a, b) (a)=max(a, b)
#define chmin(a, b) (a)=min(a, b)
#define moC(a, s, b) (a)=((a)s(b)+MOD)%MOD
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
static const ll INF=1e18;
static const ll MAX=101010;
static const ll MOD=1e9+7;


/*
 for(i=0; i<N; i++)
   cin >> a[i];
*/


int main() {
  ll i, j, k;
  
  ll N, X;
  cin >> N >> X;
  ll a[MAX];
  
  map<ll, ll> mp;
  for(i=0; i<N; i++) {
    cin >> a[i];
    mp[a[i]]++;
  }
  
  ll ans=0;
  for(i=0; i<N; i++) ans+=mp[X-a[i]];
  
  pt(ans);
  
  
  
  
}