using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static void Main()
    {
        var c = NList;
        var (n, k) = (c[0], c[1]);
        var a = NList;
        Array.Sort(a);

        var dp1 = new bool[n + 1][];
        for (var i = 0; i < dp1.Length; ++i) dp1[i] = new bool[k + 1];
        dp1[0][0] = true;
        for (var i = 0; i < n; ++i)
        {
            dp1[i + 1][0] = true;
            for (var j = 0; j <= k; ++j)
            {
                if (dp1[i][j])
                {
                    dp1[i + 1][j] = true;
                    if (j + a[i] <= k) dp1[i + 1][j + a[i]] = true;
                }
            }
        }
        if (!dp1[n][k])
        {
            WriteLine(-1);
            return;
        }
        var dp2 = new bool[n + 1][];
        for (var i = 0; i < dp2.Length; ++i) dp2[i] = new bool[k + 1];
        dp2[n][0] = true;
        for (var i = n - 1; i >= 0; --i)
        {
            for (var j = 0; j <= k; ++j)
            {
                if (dp2[i + 1][j])
                {
                    dp2[i][j] = true;
                    if (j + a[i] <= k) dp2[i][j + a[i]] = true;
                }
            }
        }
        var res = 0;
        for (var i = 0; i < n; ++i)
        {
            var flg = false;
            for (var j = 0; j <= k; ++j)
            {
                if (dp1[i][j] && dp2[i + 1][k - j])
                {
                    flg = true;
                    break;
                }
            }
            if (!flg) ++res;
        }
        WriteLine(res);
    }
}