#include<bits/stdc++.h>
#include <atcoder/all>
#ifdef LOCAL
#include <debug_print.hpp>
#define debug(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#define debug(...) (static_cast<void>(0))
#endif
using namespace atcoder;
using mint=modint998244353;
using namespace std;
using ll=long long;
using ul=unsigned long long;
int dx[9] = {-1, 1, 0, 0, -1, -1, 1, 1, 0};
int dy[9] = {0, 0, -1, 1, -1, 1, -1, 1, 0};
using Graph=vector<vector<int>>;
ll op(ll a,ll b){return min(a,b);}
ll e(){return 2e9;}
int main(){
	ll MOD=2305843009213693951;
	int N,K;
	cin>>N>>K;
	set<ll>st;
	vector<ll>A(N);
	for(int i=0;i<N;i++)cin>>A[i];
	for(int i=0;i<(1<<N);i++){
		if(__popcount(i)<K)continue;
		ll sum=0,time=1;
		for(int j=0;j<N;j++){
			if((i>>j)&1)sum+=A[j],time*=A[j],time%=MOD;
		}
		st.insert(sum);
		st.insert(time);
	}
	cout<<st.size()<<endl;
}