#include <bits/stdc++.h>
#define all(a) a.begin(), a.end()
#define popcount(x) __builtin_popcountll(x)
using namespace std;
using namespace chrono;
long long delivery(int n, int k, int l, int* a) {
    return min({
        a[n-1]*2,
        2*(l - a[0]),
        l
    });
}
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