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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <iostream>
#include <iomanip>
#include <string>
#include <vector>
#include <array>
#include <algorithm>
#include <numeric>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <bitset>
#include <valarray>
#include <utility>
#include <tuple>
#include <cmath>
#include <random>

using ll = long long;

//各種nil
template <class T>
constexpr T nil = static_cast<T>(-1);

constexpr int nil_i = nil<int>;
constexpr int nil_ll = nil<ll>;
constexpr double nil_d = nil<double>;

//vector
template <class T>
using vec = std::vector<T>;

template <class T>
struct Vec2D
{
    T x, y;
};

void solve()
{
    using namespace std;
    int n, k;
    cin >> n >> k;
    vec<int> v(n);

    for (auto& x : v) cin >> x;

    sort(make_reverse_iterator(v.end()), make_reverse_iterator(v.begin()));

    cout << accumulate(v.begin(), v.begin() + k, 0) << endl;

}

int main()
{
    solve();
    return 0;
}