#include <bits/stdc++.h>

using namespace std;

int main() {
    int n, p, q;
    cin >> n;
    vector<float> v1;
    for (int i = 0; i < n; ++i) {
        float f;
        cin >> f;
        v1.push_back(f);
    }
    cin >> p >> q;
    //排序(升序)
    sort(v1.begin(), v1.end(), less<float>());
    //删除第p个数据
    v1.erase(v1.begin() + p);
    //输出第q个数据
    cout << v1[q - 1] << endl;
    return 0;
}