#include<iostream>
#include<cmath>
#include<iomanip>
#include<algorithm>
#include<cstdlib>
#include<cstring>
#include<vector>
#include<utility>

#define ll long long
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define rall(s)  s.rbegin(), s.rend()
#define ceill(n, m) (((n) / (m)) + ((n) % (m) ? 1 : 0))
using namespace std;

void Fast_IO(){
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
    #endif
}





void solve(){
  ll n,k; cin>>n>>k;
  vector<ll>v;
  vector<bool>negative(10000005);
  vector<bool>positive(10000005);
  while(n--){
      ll x; cin>>x;
      if(x<0){
          if(negative[abs(x)]==0){
              v.push_back(x);
              negative[abs(x)]=1;
          }
      }else{
          if(positive[x]==0){
              v.push_back(x);
              positive[x]=1;
          }
      }

  }
  ll counter=0;
//   for(int i=0; i<sz(v); i++) cout<<v[i]<<' ';
  for(int i=0;i<sz(v)-1;i++)
  for(int j=i+1; j<sz(v);j++){
      if(abs(v[i]-v[j])==k) counter++;
    //   cout<<abs(v[i]-v[j])<<'\n';
  }
cout<<counter;



}

int main(){
    Fast_IO();
int t =1;
//cin>>t;
while(t--){
solve();
}
return 0;
}