#include <iostream>
#include <string>
#include <cmath>
#include <vector>
#include <stack>
#include <set>
#include <array>
#include <deque>
#include <queue>
#include <cstdio>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <algorithm>
#include <utility>
#include <climits>
#include <iomanip>
#define ll long long
#define endl '\n'
#define fast ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
using namespace std;
int main(){
int N, M;
cin >> N >> M;
vector<long long> a(N);
for(int i=0;i<N;i++)
cin >> a[i];
long long current = 0;
int modifications = 0;
for(int i=0;i<N;i++){
if(a[i] > current + M){
modifications++;
current = current + M;
}
else {
current = a[i];
}
}
cout << modifications << "\n";
}
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