C++ :

#include <iostream>
using namespace std;

int main(){
	int a[1010],i,n,x,p,t,j;
	cin>>n;
	for(i = 0;i < n;i++){
		cin>>a[i];
	}
	cin>>x;
	
	//排序 
	for(i = 1;i <= n - 1;i++){
		for(j = 0;j <= n - i - 1;j++){
			if(a[j] < a[j + 1]){
				t = a[j];
				a[j] = a[j + 1];
				a[j + 1] = t;
			}
		}
	}
	
	cout<<a[x - 1]<<endl;
}

Java :

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]);
    }
}

Python :

n=int(input())
a=input().split()
a=list(map(int,a))
a=sorted(a)
a.reverse()
x=int(input())
print(a[x-1])