import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;
import java.util.Comparator;
import java.util.ArrayList;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author silviase
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        No1046FruitsRush solver = new No1046FruitsRush();
        solver.solve(1, in, out);
        out.close();
    }

    static class No1046FruitsRush {
        public void solve(int testNumber, Scanner in, PrintWriter out) {

            int n = in.nextInt();
            int k = in.nextInt();
            ArrayList<Integer> al = new ArrayList<>();
            for (int i = 0; i < n; i++) {
                al.add(in.nextInt());
            }
            al.sort(Comparator.reverseOrder());
            int sum = al.get(0);
            for (int i = 1; i < k; i++) {
                if (al.get(i) > 0) {
                    sum += al.get(i);
                }
            }
            out.println(sum);

        }

    }
}