#include "iostream"
#include "climits"
#include "list"
#include "queue"
#include "stack"
#include "set"
#include "functional"
#include "algorithm"
#include "string"
#include "map"
#include "unordered_map"
#include "unordered_set"
#include "iomanip"
#include "cmath"
#include "random"
#include "bitset"
#include "cstdio"
#include "numeric"
#include "cassert"
#include "ctime"

using namespace std;

//constexpr long long int MOD = 1000000007;
constexpr long long int MOD = 998244353;
constexpr double EPS = 1e-8;

//int N, M, K, T, H, W, L, R;
long long int N, M, K, T, H, W, L, R;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	cin >> N >> M;
	vector<int>v(N);
	for (auto& i : v)cin >> i;
	if (M == 1) {
		int mx = 0;
		for (int i = 1; i < N; i += 2) {
			mx = max(mx, v[i]);
		}
		cout << mx << endl;
		return 0;
	}
	v.erase(v.begin());
	sort(v.rbegin(), v.rend());
	long long ans = 0;
	for(int i=0;i<M;i++){
		ans += v[i];
	}
	cout << ans << endl;
}