#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
ld pie=3.141592653589793;
ll inf=14449999999999994;
ll mod=1000000007;
int main(){
    ll n,k;
    cin >> n >> k;
    vector<ll>a(n);
    for (ll i = 0; i < n; i++)
    {
        cin >> a[i];
        a[i]-=k;
    }
    map<ll,ll>memo;
    memo[0]=1;
    for (ll i = 0; i < n; i++)
    {
        map<ll,ll>dp;
        for(auto v:memo){
            dp[v.first]+=v.second;
            dp[v.first+a[i]]+=v.second;
        }
        memo=dp;
    }
    ll ans=0;
    for(auto v:memo){
        if (v.first>=0)
        {
            ans+=v.second;
            ans%=mod;
        }
    }
    ans-=1;
    ans%=mod;
    ans+=mod;
    ans%=mod;
    cout << ans << endl;
}