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#include <iostream>
using namespace std;

int main() {
    int n, k;
    cin >> n >> k;
    int a[1000];
    for (int i = 0; i < n; i++) cin >> a[i];

    int suma = 0;

    for (int i = 1; i < n; i++) {
        if (a[i] < a[i-1] - k) {
            int potrzebne = (a[i-1] - k) - a[i];
            suma += potrzebne;
            a[i] += potrzebne;
        }
    }

    cout << suma << endl;
    return 0;
}