#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define vi vector<int>
#define vll vector<ll>
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define sec second
#define all(x) (x).begin(), (x).end()
#define endl '\n'
#define yes cout<<"YES\n"
#define no cout<<"NO\n"
//#define ios::sync_with_stdio(false); cin.tie(nullptr);
#define fore(i,a,b) for(int i=(a); i<=(b); ++i)
#define forr(i,a,b) for(int i=(a); i>=(b); --i)
#define rep(i,n) for(int i=1;i<=(n);++i)
#define rep2(i,n) for(int i=0;i<(n);++i)
const ll INF = 1e18;
const int MOD = 1e9 + 9;
int dx[4] = {1, -1, 0, 0};
int dy[4] = {0, 0, 1, -1};
bool inrange(int i, int j, int n, int m){
return (i >= 1 && j >= 1 && i <= n && j <= m);
}
/////////
/*
*/
const int N = 75;
int ar[N+3], n, d, b[N+3];
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cin >>n >>d;
fore(i,1, n)cin >> ar[i];
sort(ar+1, ar+n+1);
fore(i, 1, n){
fore(j, 1, i-1){
if(ar[i] <= ar[j]+d)b[i]++;
}
b[i]++;
}
ll ans = 1;
fore(i, 2, n){
ans = ans * b[i];
}
cout << ans;
return 0;
}
/*
*/
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