#include<bits/stdc++.h>
using namespace std;
int n, m, a[200005], dp[200005];
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);cout.tie(0);
cin>>n>>m;
for(int i = 1; i <= n; i++) cin>>a[i];
memset(dp, 0x3f, sizeof(dp));
dp[0] = 0;
int h = 0;
for(int i = 1; i <= n; i++){
if(a[i] - h <= m){
dp[i] = dp[i-1];
h = a[i];
}
else{
int up = dp[i-1] + 1;
int down = dp[i-1] + 1;
dp[i] = min(up, down);
h += m;
}
}
cout<<dp[n];
return 0;
}
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