#include <bits/stdc++.h>
using namespace std;
int main() {
    int n, m;
    cin >> n >> m;
    vector<int> a(n + 1); 
    a[0] = 0;
    for (int i = 1; i <= n; ++i) cin >> a[i];
    int res = 0;
    for (int i = 1; i <= n; ++i) {
        if (a[i] - a[i - 1] > m) {
            res++;
            a[i] = a[i - 1] + m; 
        }
    }
    cout << res;
}
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