import java.io.*;
import java.util.*;

public class Main {
    static ArrayList<HashMap<Integer, HashSet<Integer>>> dp = new ArrayList<>();
    static int[] values;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int k = sc.nextInt();
        values = new int[n];
        for (int i = 0; i < n; i++) {
            dp.add(new HashMap<>());
            values[i] = sc.nextInt();
        }
        HashSet<Integer> ans = dfw(n - 1, k);
        if (ans == null) {
            System.out.println(-1);
        } else {
            System.out.println(ans.size());
        }
    }
    
    static HashSet<Integer> dfw(int idx, int count) {
        if (count == 0) {
            return new HashSet<>();
        }
        if (count < 0 || idx < 0) {
            return null;
        }
        if (!dp.get(idx).containsKey(count)) {
            HashSet<Integer> ans1 = dfw(idx - 1, count);
            HashSet<Integer> ans2 = dfw(idx - 1, count - values[idx]);
            if (ans1 == null) {
                if (ans2 == null) {
                    dp.get(idx).put(count, null);
                } else {
                    HashSet<Integer> ans = new HashSet<>();
                    ans.addAll(ans2);
                    ans.add(idx);
                    dp.get(idx).put(count, ans);
                }
            } else {
                if (ans2 == null) {
                    dp.get(idx).put(count, ans1);
                } else {
                    HashSet<Integer> ans = new HashSet<>();
                    for (int x : ans1) {
                        if (ans2.contains(x)) {
                            ans.add(x);
                        }
                    }
                    dp.get(idx).put(count, ans);
                }
            }
        }
        return dp.get(idx).get(count);
    }
}


class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}