include <bits/stdc++.h>
using namespace std; int n,a[1000010],ans=0,s; int main() {
cin>>n>>s;
for(int i=1;i<=n;i++)
{
cin>>a[i];
}
for(int i=1;i<n;i++)
{
for(int j=i+1;j<=n;j++)
{
if(a[j]-a[i]>s)
break;
else
ans++;
}
}
cout<<ans;
return 0;
}