#include <bits/stdc++.h>   using namespace std;   int main() {     int n, d, moves = 0;     int* b;     cin >> n >> d;     b = new int[n];     cin >> b[0];     for (int i = 1; i < n; i++) {       cin >> b[i];       if (b[i] <= b[i - 1]) {         int time = (b[i - 1] - b[i]) / d + 1;         b[i] += time * d;         moves += time;       }     }     delete[] b;     cout << moves;   }   