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#include "bits/stdc++.h"
using namespace std;

using ll = long long;

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);

    ll n,k;
    cin >> n >> k;
    vector<ll> V(n);
    for(int i = 0; i < n; i++) {
        cin >> V[i];
    }
    ll result = 0;
    for(int j= 0;j<n;j++){
for(int i = 0; i< n-1; i++) {
        if(abs(V[i] - V[i+1])>k) {
            if(V[i]>V[i+1]){
                ll before = V[i+1];
                V[i+1]=V[i]-k;
                result += V[i+1] - before;
            }
            else{
                ll before = V[i];
                V[i]=V[i+1]-k;
                result += V[i] - before;
            }
        }
    }
    }
    cout<<result;
    
}