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;

}