#include <iostream>
using namespace std;
constexpr int MOD = 1000000007;
int dp[20200];
int main() {
  int n, k, a;
  cin >> n >> k;
  dp[10000] = 1;

  for (int i = 0; i < n; ++i) {
    cin >> a;
    a = a - k;
    if (a < 0)
      for (int j = -a; j <= 20000; ++j) (dp[j + a] += dp[j]) %= MOD;
    else
      for (int j = 20000 - a; j >= 0; --j) (dp[j + a] += dp[j]) %= MOD;
  }

  int ans = 0;
  for (int i = 10000; i <= 20000; ++i) (ans += dp[i]) %= MOD;
  cout << ans - 1 << endl;
  return 0;
}