#ifndef ONLINE_JUDGE
#include <iostream>
#include <vector>
#include <set>
#include <map>
#include <unordered_map>
#include <algorithm>
#else
#include <bits/stdc++.h>
#endif
using namespace std;
#define int long long
#define double long double
#define vec vector
#define vi vec<int>
#define pii pair<int,int>
#define vpi vec<pii>
#define MP make_pair
#define PB push_back
#define F first
#define S second
#define pq priority_queue
#define all(v) v.begin(), v.end()
signed main() {
int n,t;
cin >> n >> t;
vi v(n+1,0);
for (int i = 1; i <= n; i++) cin >> v[i];
int u = 0;
for (int i = 1; i <= n; i++) {
if (v[i] - v[i - 1] > t) u++ , v[i] = v[i - 1] + t;
if (i == 1 and v[i] > t) u++ , v[i] = t;
}
cout << +u << endl;
}
