#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
long long delivery(int N, int K, int L, int p[]) {
    ll ans = 0;
    for(int i = 0; i < N; i++){
        ans += min(p[i], L - p[i]) * 2;
    }
    return ans;
}
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