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#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define int long long
#define mp make_pair
signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n , k;
    cin >> n >> k;
    vector <int> v(n + 1);
    int ans = 0;
    bool dziala = true;
    for(int i = 1; i <= n; i++)cin >> v[i];
    for(int i = 1; i < n; i++)
    {
        if(abs(v[i] - v[i + 1]) > k)dziala = false;
    }
    while(!dziala)
    {
        for(int i = 1; i < n; i++)
        {
            if(v[i] < v[i + 1])
            {
                if(v[i + 1] - v[i] <= k)continue;
                else 
                {
                    int add = v[i + 1] - v[i] - k;
                    v[i] += add;
                    ans += add;
                }
            }
            else
            {
                if(v[i] - v[i + 1] <= k)continue;
                int add = v[i] - v[i + 1] - k;
                v[i + 1] += add;
                ans += add;
            }
        }
        dziala = true;
        for(int i = 1; i < n; i++)
        {
            if(abs(v[i] - v[i + 1]) > k)dziala = false;
        }
    }
    cout << ans;
    return 0;
}