#include <iostream>
#include <vector>
#include<map>
#include<string>
#include<algorithm>
#include<sstream>
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];
	}
	int sum=0;
	sort(a.begin(), a.end(), greater<int>());
	for (int i = 0; i < k; i++) {
		if (i == 0) {
			sum += a[0];
		}else if (a[i] > 0) {
			sum += a[i];
		}
	}
	cout << sum<<endl;
}