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#include <iostream>
using namespace std;
int a[1005];
int32_t main() {
  ios_base::sync_with_stdio(0);
  int n, k;
  cin >> n >> k;

  for (int i = 1; i <= n; i++)
    cin >> a[i];

  int wynik = 0;
  for (int rep = 1; rep <= n; rep++) {
    for (int i = 1; i < n; i++) {
      int delta = a[i] - a[i + 1];
      if (delta > k) {
        wynik += delta - k;
        a[i + 1] += delta - k;
      } else if (delta < -k) {
        wynik += - delta - k;
        a[i] += -delta - k;
      }
    }
  }

  cout << wynik << "\n";
}