#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main() {

	int N, K;
	cin >> N >> K;

	vector<int> A(N);

	for (int i = 0; i < N; i++) {
		cin >> A[i];
	}

	sort(A.begin(), A.end(), greater<int>());

	int ans = A[0];
	for (int i = 1; i < K; i++) {
		if (A[i] > 0) {
			ans += A[i];
		}
	}

	cout << ans << endl;

}