#include <algorithm>
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <boost/multiprecision/cpp_int.hpp>
#include <cmath>
#include <cstdio>
#include <functional>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
namespace mp = boost::multiprecision;
using Bint = mp::cpp_int;
using namespace std;
using ll = long long;
int main() {
  int n, k;
  cin >> n >> k;
  vector<Bint> a(n);
  map<Bint, Bint> mp;
  for(int i = 0; i < n; i++) {
    cin >> a[i];
  }
  for(int bit = 0; bit < (1 << n); bit++) {
    int cnt = 0;
    Bint s = 0, m = 1;
    for(int i = 0; i < n; i++) {
      if(bit & (1 << i)) {
        cnt++;
        s += a[i];
        m *= a[i];
      }
    }
    if(cnt >= k) {
      mp[s]++;
      mp[m]++;
    }
  }
  cout << mp.size() << endl;

  return 0;
}