import java.util.*;
public class KthLargestValue {

	public static int KLargestValue(int[] input1,int input2)
    {

      int output=0;
      Arrays.sort(input1);    //sorted array in ascending order
      int k=0;
      int [] largeToSmall=new int[input1.length];
      for(int i=input1.length-1;i>=0;i--){
    	  largeToSmall[k]=input1[i];      //sorting array in descending order
    	  k++;

      }
      output=largeToSmall[input2-1];      //getting kth largest value from array.
      return output;

    }
	public static void main(String [] args){
		Scanner in = new Scanner(System.in);
        int output = 0;
        int ip1_size = 0;
        ip1_size = Integer.parseInt(in.nextLine().trim());
        int[] ip1 = new int[ip1_size];
        int ip1_item;
        for(int ip1_i = 0; ip1_i < ip1_size; ip1_i++) {
            ip1_item = Integer.parseInt(in.nextLine().trim());
            ip1[ip1_i] = ip1_item;
        }
        int ip2 = Integer.parseInt(in.nextLine().trim());
        output = KLargestValue(ip1,ip2);
        System.out.println(String.valueOf(output));
        in.close();
	}
}