#pragma GCC optimize("Ofast")
#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <queue>
#include <cstdio>
#include <ctime>
#include <assert.h>
#include <chrono>
#include <random>
#include <numeric>
#include <set>
#include <deque>
#include <stack>
#include <sstream>
#include <utility>
#include <cstring>
#include <unordered_map>
#include <unordered_set>
#include <tuple>
#include <array>
#include <bitset>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}
inline double time() {
    return static_cast<long double>(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count()) * 1e-9;
}

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n,k; cin >> n >> k;
    vector<ll> a(n);
    for(int i=0;i<n;i++){
        cin >> a[i];
    }
    priority_queue<ll,vector<ll>,greater<ll>> pq;
    ll sum = 0;
    ll res = 0;
    for(int i=n-1;i>=0;i--){
        if(i%2){
            if(pq.size() == k-1){
                res = max(res,sum+a[i]);
            }
        }
        sum += a[i];
        pq.push(a[i]);
        if(pq.size() > k-1){
            sum -= pq.top(); pq.pop();
        }
    }
    cout << res << endl;
}