#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#pragma GCC optimize("unroll-loops,no-stack-protector")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
using namespace __gnu_pbds;
using namespace std;
template <typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long ll;
typedef long double ld;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
ll n,d;
cin >> n >> d;
vector <ll> arr(n+1);
ll maxi = 0;
for (int z=1;z<=n;z++){
cin >> arr[z];
maxi = max(maxi,arr[z]);
}
vector <vector<ll>> dp(n+1,vector<ll>(maxi+1,0));
for (ll z=1;z<=n;z++){
for (ll h=0;h<=maxi;h++){
ll mini = LLONG_MAX;
for (int x=max(ll(0),h-d);x<=min(maxi,h+d);x++){
mini = min(mini,dp[z-1][x]);
}
dp[z][h] = mini+abs(arr[z]-h);
}
}
ll mini = LLONG_MAX;
for(ll z=0;z<=maxi;z++){
mini = min(dp[n][z],mini);
}
cout << mini << endl;
}
