#include<bits/stdc++.h>
#define ll long long
#define rep(i,s,n) for(long long i=s;i<(long long)(n);i++)
using namespace std;
int main(){ll n,k;cin>>n>>k;ll a[n];rep(i,0,n){cin>>a[i];}set<ll>s;rep(i,0,(1<<n)){ll m=0,c=0,p=1;rep(j,0,n){if((1<<j)&i){c++;m+=a[j];p*=a[j];}}if(c>=k){s.insert(m);s.insert(p);}}cout<<s.size()<<endl;}