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 C (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
#define REP(a) for(i = 0; i < a; i++)

int compare(const void *a,const void *b) {
    return *(int*)b - *(int*)a;
}

int main(void) {
    int n,k,i,sum = 0;
    scanf("%d%d",&n,&k);
    int a[n];
    REP(n) {
        scanf("%d",&a[i]);
    }
    qsort(a, n, sizeof(int), compare);
    REP(k) {
        sum += a[i];
    }
    printf("%d\n",sum);
    return 0;
}