#include <iostream>
#include <algorithm>
using namespace std;
int a[10001], n, k, m = 100000;
int main(){
	cin >> n >> k;
	for(int i = 1; i <= n; i++) cin >> a[i];
	sort(a + 1, a + n + 1);
	for(int i = 1; i <= n; i++){
		if(m != a[i]){
			m = a[i];
			k--;
			if(k == 0){
				cout << a[i] << endl;
				return 0;
			}
		}
	}
	return 0;
}

求助，4、6、9三个点WA了