package main

import (
	"fmt"
	"sort"
)

func main() {
	var N, K int
	fmt.Scan(&N, &K)
	G := make([]int, N)
	for i := range G {
		fmt.Scan(&G[i])
	}
	sort.Ints(G)
	total :=  0 
		if G[N-1] >=0	{
			for i := (N - K); i < N ; i++ {
				if G[i] > 0 {
				total += G[i]
				}
			}
		}else{
			total = G[N-1]
		} 
	fmt.Println(total)
}