#include<bits/stdc++.h>
using namespace std;
#define N 10000005
long long dp[2][N], ans = 1e18;
long long delivery(int n, int k, int l, int p[N]) {
for (int i = 1; i <= n; i++)
dp[0][i] = dp[0][max(0, i-k)] + p[i-1] + min(p[i-1], l-p[i-1]);
for (int i = n; i > 0; i--)
dp[1][i] = dp[1][min(n+1, i+k)] + l - p[i-1] + min(p[i-1], l - p[i-1]);
for (int i = 0; i <= n; i++)
ans = min(ans, dp[0][i] + dp[1][i+1]);
return ans;
}
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