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#include <bits/stdc++.h>


using namespace std;


int main() {
    ios_base::sync_with_stdio(false);

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

    vector <int> a(n);
    for (int &ai : a) {
        cin >> ai;
    }

    vector <int> aBound = a;
    for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) {
        int d = abs(j - i);
        long long bound = a[i] - (long long) d * k;

        if (bound > aBound[j]) {
            aBound[j] = bound;
        }
    }

    int ans = 0;
    for (int i = 0; i < n; i++) {
        ans += aBound[i] - a[i];
    }

    cout << ans;

    return 0;
}