#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
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>;
int main(){
    
    int n, k;
    cin >> n >> k;
    vi a(n);
    rep(i,n) cin >> a[i];
    sort(all(a));
    int dist = 0;
    rep(i,n){
        auto it = upper_bound(all(a), a[i]);
        dist += distance(a.begin()+i, it);
        if(dist >= k) {
            cout << i+1 << endl;
            return 0;
        }
    }
    a.erase(unique(all(a)), a.end());
    cout << a.size() << endl;

}