import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		int[] a = new int[n];
		for(int i = 0;i<a.length;i++){
			a[i]=in.nextInt();
		}
		int x = in.nextInt();
		Arrays.sort(a);
		System.out.print(a[n-x]);
    }
}
/**************************************************************
	Problem: 1497
	User: admin
	Language: Java
	Result: Accepted
	Time:787 ms
	Memory:40324 kb
****************************************************************/