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;
        var dp2 = new bool[k + 1];
        for (var j = 0; j < n; ++j)
        {
            for (var p = dp2.Length - a[j] - 1; p >= 0; --p)
            {
                if (p == 0 || dp2[p]) dp2[p + a[j]] = true;
            }
        }
        if (!dp2[k])
        {
            WriteLine(-1);
            return;
        }
        var res = 0;
        for (var i = 0; i < n; ++i)
        {
            var dp = new bool[k + 1];
            for (var j = 0; j < n; ++j)
            {
                if (i == j) continue;
                for (var p = dp.Length - a[j] - 1; p >= 0; --p)
                {
                    if (p == 0 || dp[p]) dp[p + a[j]] = true;
                }
            }
            if (!dp[k]) ++res;
        }
        WriteLine(res);
    }
}