#include <bits/stdc++.h>
template<class T> inline bool chmin(T&a, T b){if(a > b){a = b; return true;}else{return false;}}
template<class T> inline bool chmax(T&a, T b){if(a < b){a = b; return true;}else{return false;}}
#define ll long long
#define double long double
#define rep(i,n) for(int i=0;i<(n);i++)
#define REP(i,n) for(int i=1;i<=(n);i++)
#define mod (ll)(1e9+7)
#define inf (ll)(3e18+7)
#define eps (double)(1e-9)
#define pi (double) acos(-1)
#define P pair<int,int>
#define PiP pair<int,pair<int,int>>
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
using namespace std;

int main() {
    int n, k;
    cin >> n >> k;
    vector<int> a(n);
    rep(i, n)cin >> a[i];
    set<__int128_t> st;
    for(int bit = 0; bit < (1<<n); bit++){
        __int128_t cnt = 0, s = 0, m = 1;
        rep(i, n){
            if(bit & (1<<i)){
                cnt++;
                s += a[i];
                m *= a[i];
            }
        }
        if(cnt < k)continue;
        st.insert(s);
        st.insert(m);
    }
    cout << st.size() << endl;
}