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

void solve() {
	int n, k; cin >> n >> k;
	vector<int> a(n + 1);
	for(int i = 1; i <= n; i++)
		cin >> a[i];
	int ans = 0;
	for(int i = 1; i <= n; i++) {
		int res = 0;
		for(int j = 1; j <= n; j++)
			res = max(res, a[j] - k * abs(i - j));
		ans += res - a[i];
	} cout << ans << '\n';
}

signed main() {
	ios::sync_with_stdio(false);
	ios_base::sync_with_stdio(false);
	cin.tie(0), cout.tie(0);
	// For Problem with file IO
	// #ifndef CPH
	//   freopen(".in", "r", stdin);
	//   freopen(".out", "w", stdout);
	// #endif
	int t = 1;
	// cin >> t;
	while(t--) {
		solve();
	}
	return 0;
}