#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<bitset>
#include<set>
#include<map>
#include<stack>
#include<queue>
#include<deque>
#include<list>
#include<iomanip>
#include<cmath>
#include<cstring>
#include<functional>
#include<cstdio>
#include<cstdlib>
#include<numeric>

using namespace std;

#define repr(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define rep(i, n) repr(i, 0, n)
#define INF 2e9
#define MOD 1000000007
//#define MOD 998244353
#define LINF (long long)4e18
#define jck 3.141592

const double EPS = 1e-10;

using ll = long long;
using Pi = pair<int,int>;
using Pl = pair<ll,ll>;

ll dp[110][21000];

int main(){
    int n,k; cin >> n >> k;
    vector<int> a(n);
    rep(i,n){
        cin >> a[i];
        a[i] -= k;
    }
    dp[0][10000] = 1;
    rep(i,n)rep(j,20001){
        dp[i+1][j] += dp[i][j];
        dp[i+1][j] %= MOD;
        dp[i+1][j+a[i]] += dp[i][j];
        dp[i+1][j+a[i]] %= MOD;
    }
    ll ans = 0;
    repr(i,10000,21000){
        ans += dp[n][i];
        ans %= MOD;
    }
    ans--;
    cout << ans << endl;
}