Problem:
Score : 200 points

Problem Statement

Snuke has N sticks.
The length of the i-th stick is l_i.

Snuke is making a snake toy by joining K of the sticks together.

The length of the toy is represented by the sum of the individual sticks that compose it.
Find the maximum possible length of the toy.

Constraints

1 \leq K \leq N \leq 50

1 \leq l_i \leq 50

l_i is an integer.

Input

Input is given from Standard Input in the following format:

N K
l_1 l_2 l_3 ... l_{N}

Output

Print the answer.

Sample Input 1

5 3
1 2 3 4 5

Sample Output 1

12

You can make a toy of length 12 by joining the sticks of lengths 3, 4 and 5, which is the maximum possible length.

Sample Input 2

15 14
50 26 27 21 41 7 42 35 7 5 5 36 39 1 45

Sample Output 2

386

Solution in Go (1.6) (judge verdict: Accepted)

package main

import (
	"fmt"
	"sort"
)

func main() {
	var a, b int
	fmt.Scan(&a)
	fmt.Scan(&b)
	ln := make([]int, a)
	for i := 0; i < a; i++ {
		var l int
		fmt.Scan(&l)
		ln[i] = l
	}
	fmt.Println(maximumLength(ln, b))
}

func maximumLength(ln []int, b int) int {
	sort.Ints(ln)
	var sum int
	var counter int
	for i := len(ln) - 1; i >= 0; i-- {
		if counter == b {
			break
		}
		sum += ln[i]
		counter++
	}
	return sum
}