Catlunch

#include <bits/stdc++.h>
using namespace std;

// *** Aliases
typedef long long lli;
typedef unsigned long long ulli;

lli clamp(lli n, lli lower, lli upper) {
  return std::max(lower, std::min(n, upper));
}

int main() {
    cin.tie(0); ios_base::sync_with_stdio(0); // *** Fast input
    deque <lli> D;
    lli N, K; cin >> N >> K;
    lli highest = 0;
    for (lli i = 0; i < N; i++) {lli val; cin >> val; D.push_back(val);} // Insert into deque
    lli result = 0;
    while (D.size() > 0) {
        lli max = *max_element (D.begin(), D.begin()+clamp(K, 0, D.size()));
        for (ulli i = 0; i < D.size(); i++) {
            if (D[i] == max) {
                result += D[i];
                D.erase(D.begin() + i);
                if (result > highest) highest = result;
                break;
            }
        }
    }
    cout << highest;
}