#include <bits/stdc++.h>
using namespace std;

const int MAXK = 1000;
using Line = bitset<MAXK + 1>;
int main()
{
    int N, K;
    cin >> N >> K;
    vector<int> A(N);
    for (int &x : A)
        cin >> x;
    Line ans;
    ans.set(0);
    for (int x : A)
        ans |= ans << x;
    if (!ans[K])
    {
        cout << -1 << endl;
        return 0;
    }
    vector<int> check(K + 1, -1);
    int ret = 0;
    for (int i = 0; i < N; ++i)
    {
        if (check[A[i]] != -1)
        {
            ret += check[A[i]];
            continue;
        }
        Line ans;
        ans.set(0);
        for (int j = 0; j < N; ++j)
            if (j != i)
            {
                ans |= ans << A[j];
                if (ans[K])
                    break;
            }
        check[A[i]] = !ans[K];
        if (!ans[K])
            ++ret;
    }
    cout << ret << endl;
}