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

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n, k;
  cin >> n >> k;
  vector<int> v;
  for (int i = 0; i < n; i++) {
    int a;
    cin >> a;
    v.push_back(a);
  }
  long long ans = 0;
  bool end = true;
  while(end){
    end = false;
    for(int j = 1;j<n;j++){
      if (v[j] - v[j-1] > k){
        int val = v[j] - v[j-1] - k;
        ans += val;
        v[j-1] += val;
        end = true;
      }
      if (v[j-1] - v[j] > k){
        int val = v[j-1] - v[j] - k;
        ans += val;
        v[j] += val;
        end = true;
      }
    }
  }cout << ans;
}