//...
#include <bits/stdc++.h>
using namespace std;
#define XD 1000000007
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
long long n , m , ans = 0 , q = 0;
cin >> n >> m;
vector<long long> a(n);
for(int i = 0; i < n; ++i)
cin >> a[i];
for(int i = 0; i < n; ++i)
{
if(a[i] > q + m)
{
++ans;
q = q + m;
}
else
q = a[i];
}
cout << ans << endl;
return 0;
}
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