#include <bits/stdc++.h>
#include "boxes.h"
using namespace std;
using ll = long long;
using pi = pair<ll, ll>;
using vi = vector<ll>;
#define pb emplace_back
// for i from 1 to K, go till p[l + i] and return and reduce l to l + i + 1
// similarly for r, go till p[r - i] and return and reduce r to r - i - 1
ll calc(int l, int r, int n, int k, int L, int p[]) {
if(r < l) return 0;
ll ans = LLONG_MAX;
ll sum = 0;
ll last = 0;
for(int i = 0; i < k; ++i) {
if(l + i >= n) break;
sum += 2 * (p[l + i] - last);
last = p[l + i];
ans = min(ans, sum + calc(l + i + 1, r, n, k, L, p));
}
sum = 0;
last = L;
for(int i = 0; i < k; ++i) {
if(r - i < 0) break;
sum += 2 * (last - p[r - i]);
last = p[r - i];
ans = min(ans, sum + calc(l, r - i - 1, n, k, L, p));
}
return ans;
}
ll delivery(int N, int K, int L, int p[]) {
ll ans = calc(0, N - 1, N, K, L, p);
return ans;
}
