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#include <iostream>

using namespace std;

int main(int argc, char const *argv[])
{
    int n, k;
    int a[1000];
    long long res=0;

    cin >> n >> k;
    for (int i=0; i<n; i++) cin >> a[i];

    for (int i=1; i<n; i++) {
        int diff = abs(a[i-1]-a[i]);
        if (diff > k) {
            res += diff - k;
            if (a[i-1] > a[i]) a[i] = a[i-1] - k;
            else {
                a[i-1] = a[i] - k;
                for (int j=i-1; j>0; j--) {
                    diff = a[j]-a[j-1];
                    if (diff <= k) break;
                    res += diff - k;
                    a[j-1] = a[j] - k;
                }
            }
        }
    }

    cout << res << endl;

    return 0;
}