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

const int MAXK = 100000;
using Line = bitset<2 * 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;
    }
    int ret = 0;
    for (int x : A)
        if (!ans[K + x])
            ++ret;
    cout << ret << endl;
}