#include <bits/stdc++.h>
#define debug(x) cerr << #x << " " << x << "\n"
#define debugs(x) cerr << #x << " " << x << " "
using namespace std;
typedef long long ll;
typedef pair <ll, ll> pii;
const ll NMAX = 1000001;
const ll VMAX = 26;
const ll INF = (1LL << 55);
const ll MOD = 90000000000000001;
const ll BLOCK = 1000000;
const ll base = 1000000001;
const ll nr_of_bits = 18;
int v[NMAX];
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int n, i, m;
cin >> n >> m;
for(i = 2; i <= n + 1; i++){
cin >> v[i];
}
int cnt = 0;
for(i = 1; i <= n; i++){
if(v[i] + m < v[i + 1]){
v[i + 1] = v[i] + m;
cnt++;
}
}
cout << cnt;
return 0;
}
