#include<stdio.h>

try:
n=int(input())
if n <= 0;
print("Invalid Input")
return
arr = list(map(int, input().split()))
if len(arr) != n;
print("Invalid Input")
return
k = int(input())
if k<1 or k>n;
print("Invalid Input")
return
arr.sort()
print(arr[k-1])
expert:
print("Invalid Input")