#include "bits/stdc++.h"
//#include "atcoder/all"
using namespace std;
//using namespace atcoder;
//using mint = modint1000000007;
//const int mod = 1000000007;
//using mint = modint998244353;
//const int mod = 998244353;
//const int INF = 1e9;
//const long long LINF = 1e18;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define rrep(i, n) for (int i = (n-1); i >= 0; --i)
#define rrep2(i,l,r)for(int i=(r-1);i>=(l);--i)
#define all(x) (x).begin(),(x).end()
#define allR(x) (x).rbegin(),(x).rend()
#define endl "\n"
//多倍長整数
#include <boost/multiprecision/cpp_int.hpp>
namespace mp = boost::multiprecision;
using Bint = mp::cpp_int;
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int N, K;
	cin >> N >> K;
	vector<int>A(N);
	rep(i, N) { cin >> A[i]; }
	set<Bint>st;
	rep(i, (1 << N)) {
		Bint sum = 0;
		Bint seki = 1;
		int count = 0;
		rep(j, N) {
			if (1 & (i >> j)) {
				sum += A[j];
				seki *= A[j];
				count++;
			}
		}
		if (count >= K) {
			st.insert(sum);
			st.insert(seki);
		}
	}
	cout << st.size() << endl;
	return 0;
}