#include<bits/stdc++.h>
using namespace std;
#define Study ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define ll long long
#define ull unsigned long long
#define pb push_back
#define ff first
#define ss second
#define ins insert
#define all(x) x.begin(),x.end()
#define fori(x,y,z) for(ll x=y;x<=z;x++)
const ll INF=1e18;
const ll sz=5e4+10;
const ll mod=1e9+7;
void work(){
ll n,m;
cin>>n>>m;
vector<ll>v(n+10,0);
fori(i,1,n){
cin>>v[i];
}
ll cnt=0;
vector<ll>check(n+10,0);
fori(i,0,n-1){
if(v[i+1]-v[i]>m){
v[i+1]=v[i]+m;
cnt++;
}
}
cout<<cnt<<endl;
}
int main(){
Study;
ll t=1;
//cin>>t;
while(t--){
work();
}
}
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