using System; using System.Linq; namespace _1046 { class Program { static void Main(string[] args) { var _ = Console.ReadLine().Split(); var n = int.Parse(_[0]); var k = int.Parse(_[1]); var a = Console.ReadLine().Split().Select(x => int.Parse(x)).ToArray(); var s = a.Where(x => x >= 0).OrderByDescending(x => x).Take(k).Sum(); Console.WriteLine(s); } } }