using System.Linq;
using System.Collections.Generic;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var k = int.Parse(line[1]);
        var a = new List<int>();
         line = Console.ReadLine().Trim().Split(' ');
        for (int i = 0; i < n; i++)
        {
            var t = int.Parse(line[i]);
            if (t > 0) a.Add(t);
        }
        var acc = a.Count();
        int ans;
        if (k >= acc) ans = a.Sum();
        else ans = a.OrderByDescending(x => x).Take(k).Sum();
        Console.WriteLine(ans);
    }
}