import java.io.*;
import java.util.*;
import java.util.stream.*;
import java.math.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int k = sc.nextInt();
        int[] values = new int[n];
        BigInteger[] inputs = new BigInteger[n];
        for (int i = 0; i < n; i++) {
            values[i] = sc.nextInt();
            inputs[i] = BigInteger.valueOf(values[i]);
        }
        int[] sums = new int[1 << n];
        BigInteger[] nums = new BigInteger[1 << n];
        nums[0] = BigInteger.valueOf(1);
        HashSet<BigInteger> ans = new HashSet<>();
        for (int i = 1; i < (1 << n); i++) {
            for (int j = 0; j < n; j++) {
                if ((i & (1 << j)) > 0) {
                    sums[i] = sums[i ^ (1 << j)] + values[j];
                    nums[i] = nums[i ^ (1 << j)].multiply(inputs[j]);
                    break;
                }
            }
            if (getPop(i) >= k) {
                ans.add(BigInteger.valueOf(sums[i]));
                ans.add(nums[i]);
            }
        }
        System.out.println(ans.size());
    }
    
    static int getPop(int x) {
        int pop = 0;
        while (x > 0) {
            pop += x % 2;
            x >>= 1;
        }
        return pop;
    }
} 
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    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 int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}