#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma optimize("unroll-loops")
#define fast ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define all(x) x.begin(), x.end()
#define rll(x) x.rbegin(), x.rend()
#define COMP(x) x.erase(unique(all(x)), x.end())
#define MOD 1000000007
#define MOD2 998244353
#define sz(x) (ll)x.size()
typedef __int128_t lll;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll,ll> pll;
typedef pair<ll, pll> PP;
const ll Lnf = 2e18;
ll n, h;
ll dx_L, dx_R;
ll A[202020];
priority_queue<ll> pq_L; //이 값에다가 +dx_L을 해야 원래 값이 나옴.
priority_queue<ll,vector<ll>,greater<ll>> pq_R; //마찬가지
int main(){
fast;
cin>>n>>h;
ll ans = 0;
for(int i = 1 ; i <= n ; i++){
cin>>A[i];
if(!sz(pq_L) and !sz(pq_R)){
pq_L.push(A[i]);
pq_R.push(A[i]);
continue;
}
dx_L -= h; dx_R += h;
if(A[i] < pq_L.top() + dx_L){
ans += abs(pq_L.top() + dx_L - A[i]);
pq_R.push(pq_L.top() + dx_L - dx_R);
pq_L.pop();
pq_L.push(A[i] - dx_L);
pq_L.push(A[i] - dx_L);
}
else if(A[i] > pq_R.top() + dx_R){
ans += abs(pq_R.top() + dx_R - A[i]);
pq_L.push(pq_R.top() + dx_R - dx_L);
pq_R.pop();
pq_R.push(A[i] - dx_R);
pq_R.push(A[i] - dx_R);
}
else{
pq_L.push(A[i] - dx_L);
pq_R.push(A[i] - dx_R);
}
// cout<<pq_L.top()+dx_L<<" "<<pq_R.top()+dx_R<<" "<<ans<<endl;
}
cout<<ans;
}
