package main

import (
	"fmt"
	"sort"
)

func main() {
	var N, K int
	fmt.Scan(&N, &K)
	A := make([]int, N)
	for i := range A {
		fmt.Scan(&A[i])
	}
	sort.Sort(sort.Reverse(sort.IntSlice(A)))
	ans := A[0]
	for i := 1; i < K; i++ {
		if ans+A[i] > ans {
			ans += A[i]
		} else {
			break
		}
	}
	fmt.Println(ans)
}