#include <bits/stdc++.h>

#define M_PI       3.14159265358979323846   // pi

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<ll> VI;
typedef pair<ll, ll> P;
typedef tuple<ll, ll, ll> t3;
typedef tuple<ll, ll, ll, ll> t4;

#define rep(a,n) for(ll a = 0;a < n;a++)
#define repi(a,b,n) for(ll a = b;a < n;a++)

#include <bits/stdc++.h>
using namespace std;

const ll mod = 1e9 + 7;

const ll INF = 1e15;



int main() {
	ll n, k;
	cin >> n >> k;
	vector<ll> as(n);
	rep(i, n)cin >> as[i];
	sort(as.begin(), as.end(), std::greater<ll>());
	ll sum = as[0];
	for (int i = 1; i < k; i++) {
		if (as[i] > 0) {
			sum += as[i];
		}
	}
	cout << sum << endl;
	return 0;
}