#include <bits/stdc++.h>
#define F first
#define S second
using namespace std;
using ll = long long;
using pi = pair<int, int>;
using vi = vector<int>;
template<class T> bool ckmin(T& a, T b) { return b < a ? a = b, true : false; }
template<class T> bool ckmax(T& a, T b) { return a < b ? a = b, true : false; }
int main() {
ios::sync_with_stdio(0); cin.tie(0);
int n, m; cin >> n >> m;
vector<int> a(n + 1);
for (int i = 1; i <= n; ++i) cin >> a[i];
a[0] = 1e9;
int ans = 0;
for (int i = 1; i < n; ++i) {
if (a[i] + m < a[i + 1]) {
ans++;
a[i] = a[i - 1] + m;
continue;
}
if (a[i] > a[i + 1]) {
continue;
}
}
cout << ans << "\n";
}
