#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define reps(i, a, n) for(ll i = (a); i < (ll)(n); ++i)
#define rep(i,n) reps(i,0,n)
#define all(a) (a).begin(), (a).end();
//なんかstd::vector<bool>の挙動を修正できるやつ

/* alias */
using ull = unsigned long long;

using ll = long long;
using vi = vector<int>;
using vl = vector<long>;
using vll = vector<long long>;
using vvi = vector<vi>;
using vvl = vector<vl>;
using vvll = vector<vll>;
using vs = vector<string>;
using pii = pair<int, int>;
template<>
struct std::vector<bool>: std::basic_string<bool> {
    using std::basic_string<bool>::basic_string, std::basic_string<bool>::operator =;
    explicit vector(size_t n): vector(n, false) {}
};

int main(){
    
    int n, k;
    cin >> n >> k;
    vi a(n);
    rep(i,n) cin >> a[i];
    sort(a.begin(), a.end());
    set<int> x;
    rep(i,k) x.insert(a[i]);
    
    cout << x.size() << endl;

}