#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 998244353
void solve(){
ll n, k;
cin >> n >> k;
vector<ll> h(n + 1);
for(int i = 1;i <= n ; i++){
cin >> h[i];
}
ll ans = 0, curr = 0;
if(h[1] > k){
h[1] = k;
ans++;
}
curr = h[1];
for(int i = 2;i <= n; i++){
if(h[i] - curr > k){
ans++;
if(h[i] - h[i - 2] <= 2 * k){
h[i - 1] = h[i - 2] + k;
}
else{
h[i] = h[i - 1] + k;
}
}
curr = h[i];
}
cout << ans << '\n';
}
int main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int tests = 1;
// cin >> tests;
for(int i = 1; i <= tests; i ++)
solve();
}
