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

int main() {
    int N, K; cin >> N >> K;
    vector<int> A(N);
    for (int i=0; i<N; ++i) cin >> A[i];
    vector<vector<bool>> dpl(N + 1, vector<bool>(K + 1, false));
    vector<vector<bool>> dpr(N + 1, vector<bool>(K + 1, false));
    dpl[0][0] = dpr[N][0] = true;
    for (int i=0; i<N; ++i) {
        dpl[i + 1] = dpl[i];
        for (int j=0; j+A[i]<=K; ++j) dpl[i + 1][j + A[i]] = dpl[i + 1][j + A[i]] || dpl[i][j];
    }
    for (int i=N-1; i>=0; --i) {
        dpr[i] = dpr[i + 1];
        for (int j=0; j+A[i]<=K; ++j) dpr[i][j + A[i]] = dpr[i][j + A[i]] || dpr[i + 1][j];
    }
    if (!dpl[N][K]) {
        puts("-1");
        return 0;
    }
    int ans = 0;
    for (int i=0; i<N; ++i) {
        bool not_use = true;
        for (int j=0; j<=K; ++j) {
            if (dpl[i][j] && dpr[i + 1][K - j]) not_use = false;
        }
        if (not_use) ++ans;
    }
    cout << ans << endl;
}