#include "bits/stdc++.h"
using namespace std;
int main() {
	long long N, K; cin >> N >> K;
	vector<long long>A(N);
	for (long long i = 0; i < N; i++)
		cin >> A.at(i);
	sort(A.begin(), A.end(), greater<long long>());
	long long ans = 0;
	for (long long i = 0; i < K; i++)
		ans = max(ans, ans + A.at(i));
	cout << ans << endl;
}