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#include <iostream>
#include <vector>
#include <algorithm>
#include <math.h>
#include <set>
#include <queue>
using namespace std;

constexpr int mx = 1e3 + 7;
int tab[mx];
bool isUsed[mx];

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

    int sum = 0;
    int n, k;
    cin >> n >> k;
    int x;
    for (int i = 1; i <= n; i++){
        cin >> tab[i];
    }

    if (n == 1)
    {
        cout << "0\n";
        return 0;
    }
    
    int aktMx = -1;
    int aktIndex = -1;
    int differential;

    for (int j = 0; j < n; j++) {
        aktIndex = aktMx = -1;

        for (int i = 1; i <= n; i++) {
            if (aktMx < tab[i] && isUsed[i] == false) {
                aktMx = tab[i];
                aktIndex = i;
            }
        }
        isUsed[aktIndex] = true;

        if (aktIndex == 1) {
            differential = abs(tab[aktIndex] - tab[aktIndex + 1]);
            if (differential > k) {
                tab[aktIndex + 1] += (differential - k);
                sum += (differential - k);
            }
        }
        else if (aktIndex == n) {
            differential = abs(tab[aktIndex] - tab[aktIndex - 1]);
            if (differential > k) {
                tab[aktIndex - 1] += (differential - k);
                sum += (differential - k);
            }
        }
        else {
            differential = abs(tab[aktIndex] - tab[aktIndex + 1]);
            if (differential > k) {
                tab[aktIndex + 1] += (differential - k);
                sum += (differential - k);
            }

            differential = abs(tab[aktIndex] - tab[aktIndex - 1]);
            if (differential > k) {
                tab[aktIndex - 1] += (differential - k);
                sum += (differential - k);
            }
        }
        
    }

    cout << sum << '\n';
    
    return 0;
}