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#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);

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

    vector<int> a(n);

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

    int result = 0, temp;
    for (int j = 0; j < n; ++j) {
        for (int i = 1; i < n; ++i) {
            if (a[i-1] < a[i] && a[i] - a[i-1] > k) {
                temp = a[i] - a[i-1] - k;
                a[i-1] += temp;
                result += temp;
            }
            if (a[i-1] > a[i] && a[i-1] - a[i] > k) {
                temp = a[i-1] - a[i] - k;
                a[i] += temp;
                result += temp;
            }
        }
   }

    cout << result;
}