#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;

int main() {
	int n, m,temp;
	vector<int> a;
	cin >> n;
	for (int i = 0;i < n;i++) {
		cin >> temp;
		a.push_back(temp);
	}
	cin >> m;
	sort(a.begin(), a.end());
	a.erase(unique(a.begin(), a.end()), a.end());
	cout << a[m-1];

}