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#include <bits/stdc++.h>
using namespace std;

int tab[1007];

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n, k;
    cin >> n >> k;

    for (int i = 0; i < n; i++)  {
        cin >> tab[i];
    }

    int wyn = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (tab[j] < tab[i] - k * abs(j - i)) {
                wyn += tab[i] - k * abs(j - i) - tab[j];
                tab[j] = tab[i] - k * abs(j - i);
            }

            // cout << tab[j] << " ";
        }
        // cout << "\n";
    }

    cout << wyn << "\n";
}