#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
namespace mul = boost::multiprecision;
using ll = long long;
using ld = long double;
using mint = modint998244353;

int main() {
  int N, M, K, ans = 0;
  mul::cpp_int x, y;
  cin >> N >> K;
  M = 1 << N;

  vector<int> A(N);
  set<mul::cpp_int> st;
  for (int i = 0; i < N; i++) cin >> A[i];

  for (int i = 0; i < M; i++) {
    if (__builtin_popcount(i) < K) continue;
    x = 0, y = 1;
    for (int j = 0; j < N; j++) {
      if (i >> j & 1) {
        x += A[j];
        y *= A[j];
      }
    }
    st.insert(x);
    st.insert(y);
  }
  cout << st.size() << endl;
  return 0;
}