#include "bits/stdc++.h"
// #include "grader.cpp"
#include "boxes.h"
using namespace std;
#define ll long long
#define M 20000005
ll s[M], c[M], ans, mx;
long long delivery(int N, int K, int L, int p[]) {
for(int i = 0; i < N; i++) {
s[i] = p[i] * 2;
if(i + 1 > K) s[i] += s[i - K];
}
for(int i = N - 1; i >= 0; i--) {
c[i] = (L - p[i]) * 2;
if(i + K < N) c[i] += c[i + K];
}
ans = c[0];
for(int i = 0; i < N; i++) {
ans = min(ans, s[i] + c[i + 1]);
}
for(ll i = 0; i < N; i++) {
ll c1 = 0;
if(i) c1 = s[i - 1];
// for(ll j = i; j < N; j++) {
// ans = min(ans, c1 + ((j - i + K) / K) *L + c[j + 1]);
// }
ans = min(ans,c1 + L + c[i + K]);
}
return ans;
}
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