#include "boxes.h"
#include<bits/stdc++.h>
#define ll long long
using namespace std;
ll a[10000005],dp1[10000005],dp2[10000005],n,k,l;
ll delivery(int nn,int kk,int lll,int b[]){
n=nn,k=kk,l=lll;
for(ll i=1;i<=n;i++){
a[i]=b[i-1];
dp1[i]=dp1[a[max(0ll,i-k)]]+a[i]+min(a[i],(l-a[i]));
// cout<<dp1[i]<<' ';
}
// cout<<endl;
for(ll i=n;i>=1;i--){
dp2[i]=dp2[a[min(n+1,i+k)]]+(l-a[i])+min(a[i],(n-a[i]));
// cout<<dp2[i]<<' ';
}
ll ans=0;
for(ll i=0;i<=n;i++){
ans=max(ans,dp1[i]+dp2[i+1]);
}
return ans;
}
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