#include <bits/stdc++.h>
#define ft first
#define sc second
#define lb lower_bound
#define ub upper_bound
#define pb push_back
#define pt(sth) cout << sth << "\n"
#define chmax(a, b) {if(a<b) a=b;}
#define chmin(a, b) {if(a>b) a=b;}
#define moC(a, s, b) (a)=((a)s(b)+MOD)%MOD
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
static const ll INF=1e18;
static const ll MAX=1e5+7;
static const ll MOD=1e9+7;



int main(void) {
  ll N, K;
  cin >> N >> K;
  ll a[MAX*2];
  ll i;
  
  for(i=0; i<N; i++)
    cin >> a[i];
  sort(a, a+N);
  a[N]=INF;
  
  ll ans=1;
  for(i=N-1; i>=N/2; i--) {
    ll pos=min((ll)(ub(a, a+i, K-a[i])-a), i);
    moC(ans, *, pos-(N-1-i));
  }
  
  pt(ans);
}