#include <bits/stdc++.h>
using namespace std;
#define FOR(i, begin, end) for (int i = (begin), i##_end_ = (end); i < i##_end_; i++)
#define IFOR(i, begin, end) for (int i = (end)-1, i##_begin_ = (begin); i >= i##_begin_; i--)
#define REP(i, n) FOR(i, 0, n)
#define IREP(i, n) IFOR(i, 0, n)

constexpr int MOD = 1000000007;

int main()
{
    cin.tie(nullptr), ios::sync_with_stdio(false);
    int N, K;
    cin >> N >> K;

    const int B = N * 100;
    vector<int> dp(B * 2 + 1);
    dp[B] = 1;

    while (N--)
    {
        int a;
        cin >> a;
        a -= K;
        if (a >= 0)
        {
            IREP(i, int(dp.size()) - a)
            {
                dp[i + a] += dp[i];
                if (dp[i + a] >= MOD) dp[i + a] -= MOD;
            }
        }
        else
        {
            FOR(i, -a, dp.size())
            {
                dp[i + a] += dp[i];
                if (dp[i + a] >= MOD) dp[i + a] -= MOD;
            }
        }
    }
    cout << (accumulate(dp.begin() + B, dp.end(), 0LL) - 1) % MOD << '\n';
}