#include <fstream>
#include <iterator>
#include <map>

using namespace std;


main()
{
    ifstream cin("sdo.in");
    ofstream cout("sdo.out");
    int n, k, y;
    map<int, int> h;
    cin>>n>>k;
    for(int i = 0; i < n; i++) {
        cin>>y;
        h[y] = h.count(y) + 1;
    }
    for (int i = 0; i < k; i++) {
        if (k > h[i]) {
            k-=h[i];
        } else {
            cout<<i;
            break;
        }
    }
}