#include<bits/stdc++.h>

using namespace std;
using ll = long long int;
using lc = complex<double>;

int main(void) {
    constexpr ll MOD = 1e9+7;
    constexpr double PI = acos(-1);
    cout << fixed << setprecision(32);
    cin.tie(0); ios::sync_with_stdio(false);

    ll n, k;
    cin >> n >> k;
    vector<ll> a(n);
    for(auto &e: a) cin >> e, e -= k;
    vector<ll> dp(30000);
    dp[15000] = 1;
    for(ll i=0; i<n; i++) {
        vector<ll> dq = dp;
        for(ll j=30000-1; j>=0; j--) {
            if(j-a[i]>=0) (dp[j] += dq[j-a[i]]) %= MOD;
        }
    }
    ll r = 0;
    for(ll i=15000; i<30000; i++)
        (r += dp[i]) %= MOD;
    cout << r-1 << endl;

}