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 Ruby (2.3.3) (judge verdict: Wrong Answer)

N,K = gets.split.map(&:to_i)
l = gets.split.map(&:to_i)

def swap(a,i,j)
 tmp = a[i]
 a[i] = a[j]
 a[j] = tmp
 return a
end

def bubble(a,k)
 for i in 0..(k-2)
  if a[i] > a[i+1]
   swap(a,i,i+1)
  end
  return a
 end
end

def bubble_sort(a)
 k = a.length
 while k > 1
  bubble(a,k)
  k = k-1
 end
 return a
end

bubble_sort(l)

sum = 0
for i in (N-K)..(N-1)
 sum = sum + l[i]
end

puts(sum)