using System.Collections.Generic;
using System.Linq;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var k = int.Parse(line[1]);
        line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, int.Parse);
        getAn(n, k, a);
    }
    static void getAn(int n, int k, int[] a)
    {
        var hs = new HashSet<long>();
        var imax = 1 << n;
        for (int i = 0; i < imax; i++)
        {
            if (countbit(i) >= k)
            {
                var s1 = 0;
                var s2 = 1L;
                for (int j = 0; j < n; j++)
                {
                    if (((i >> j) & 1) == 1)
                    {
                        s1 += a[j];
                        s2 *= a[j];
                    }
                }
                hs.Add(s1);
                hs.Add(s2);
            }
        }
        Console.WriteLine(hs.Count());
    }
    static int countbit(long bits)
    {
        bits = (bits & 0x55555555) + (bits >> 1 & 0x55555555);
        bits = (bits & 0x33333333) + (bits >> 2 & 0x33333333);
        bits = (bits & 0x0f0f0f0f) + (bits >> 4 & 0x0f0f0f0f);
        bits = (bits & 0x00ff00ff) + (bits >> 8 & 0x00ff00ff);
        return (int)(bits & 0x0000ffff) + (int)(bits >> 16 & 0x0000ffff);
    }
}