#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main()
{
int n,R;
cin>>n>>R;
int a[n+1];a[0]=0;
for (int i=1;i<=n;i++)
cin>>a[i];
int ans=0;
for (int i=0;i<n;i++)
for (int j=i+1;j<=n;j++)
if (a[j]-a[i]>R*(j-i))
ans++;
cout<<ans<<endl;
return 0;
}
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