import java.io.*;
import java.util.*;
import java.util.function.*;
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();
        List<BigInteger> values = IntStream.range(0, n).mapToObj(i -> new BigInteger(sc.next())).toList();
        BigInteger[] sum = new BigInteger[1 << n];
        BigInteger[] multi = new BigInteger[1 << n];
        sum[0] = new BigInteger("0");
        multi[0] = new BigInteger("1");
        HashSet<BigInteger> ans = new HashSet<>();
        IntStream.range(1, 1 << n).forEach(i -> {
            int idx = IntStream.range(0, n).filter(j -> (i & (1 << j)) > 0).findFirst().orElse(0);
            sum[i] = sum[i ^ (1 << idx)].add(values.get(idx));
            multi[i] = multi[i ^ (1 << idx)].multiply(values.get(idx));
            if (getPop(i) >= k) {
                ans.add(sum[i]);
                ans.add(multi[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 Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}