#include <iostream>
#include <algorithm>
using namespace std;
typedef long long ll;

ll N,K,A[200010] = {},inf = 1e9+7;

ll func[200010] = {0};
ll inv[200010] = {0};

ll mult(ll n, ll m){
	if(m==1) return n%inf;
	else if(m%2==0){
		ll t = mult(n,m/2);
		return (t*t)%inf;
	}else{
		ll t = mult(n,m-1);
		return (t*n)%inf;
	}
}

void factorial(ll N){
	for(ll i=0;i<=N;i++){
		if(i==0){
			func[i] = 1;
			inv[i] = 1;
		}
		else{
			func[i] = (i*func[i-1])%inf;
			inv[i] = mult(func[i],inf-2);
		}
	}
}


int main(){
	cin >> N >> K;
	factorial(N);
	for(int i=1;i<=N;i++){
		cin >> A[i];
	}
	sort(A+1,A+N+1,greater<ll>());
	ll ans = 1;
	ll r = N+1;
	for(ll i=1;i<=N;i++){
		while(A[i]+A[r-1]<=K && i<r) r--;
		if(i==r){
			ll num = N-2*(i-1);
			(ans *= inv[num/2])%=inf;
			while(num>0){
				(ans *= (num*(num-1)/2)%inf)%=inf;
				num -= 2;
			}
			break;
		}
		(ans *= N-r+1-(i-1))%=inf;
		if(ans==0) break;
	}
	cout << ans << endl;
}