#include <bits/stdc++.h>
using namespace std;

#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
#define rep3(i,m,n) for(int (i)=m;(i)<=(n);(i)++)
#define rep3rev(i,m,n) for(int (i)=m;(i)>=(n);(i)--)
#define all(a) (a.begin()),(a.end())
#define rall(a) (a.rbegin()),(a.rend())
#define fi first
#define se second
#define pb push_back
#define eb emplace_back

using ll = long long;
using vll = vector<ll>;
using vi = vector<int>;
using vvi = vector<vector<int>>;
using P = pair<int, int>;

void Main(){
    const int MOD = 1e9 + 7;
    int n, k; cin >> n >> k;
    vi a(n); rep(i, n) {
        cin >> a[i];
        a[i] -= k;
    }
    vector<vll> dp(n+5, vll(20010, 0));
    dp[0][10000] = 1;
    
    rep(i, n){
        rep3(S, -10000, 10000){
            // cout << i << " " << S << endl;
            if(S+10000-a[i] >= 0) {
                dp[i+1][S+10000] += (dp[i][S+10000] + dp[i][S+10000-a[i]]);
                dp[i+1][S+10000] %= MOD;
            }else{
                dp[i+1][S+10000] = dp[i][S+10000];
            }
        }
    }
    
    ll ans = 0;
    rep3(i, 10000, 20001) {
        ans += dp[n][i];
        ans %= MOD;
    }
    cout << (ans + MOD - 1) % MOD << endl;
    return;
}

int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    cout << fixed << setprecision(15);
    Main();
    return 0;
}