#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic pop
using namespace std;
using namespace atcoder;
#define rep(i,n)for (int i = 0; i < int(n); ++i)
#define rrep(i,n)for (int i = int(n)-1; i >= 0; --i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
template<class T> void chmax(T& a, const T& b) { a = max(a, b); }
template<class T> void chmin(T& a, const T& b) { a = min(a, b); }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using mint = modint998244353;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, k;
  cin >> n >> k;
  VI a(n);
  rep(i, n) cin >> a[i];
  const int mx = 2 * k + 1;
  vector<mint> dp(mx);
  dp[0] = 1;
  for(int x: a) {
    rrep(i, mx - x) dp[i + x] += dp[i];
  }
  if (dp[k].val() == 0) {
    cout << -1 << '\n';
    return 0;
  }
  int ans = 0;
  for(int x: a) {
    if (x == 0) continue;
    mint v;
    for(int i = k % x; i <= k; i += x) {
      v = dp[i] - v;
    }
    if (v.val() == 0) ans++;
  }
  cout << ans << '\n';
}