#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
 
int main()
{
    int t;
	cin >> t;
	while(t--){
		int n , k;
		cin >> n >> k;
		vector<int> v(n);
		for(auto &i : v){
			cin >> i;
		}
		long long sum = 0;
		sort(v.begin() , v.end());
		for(int i = 0; i < k; ++i){
			if (v[i] == 0){
				i--;
			}
			else{
				sum += v[i];
			}
		}
		
		cout << sum << endl;
	}
}