#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<vector>
using namespace std;
double Dis(double,double,double,double);
int main()
{
	freopen("sight.in","r",stdin);
	freopen("sight.out","w",stdout);
	ios::sync_with_stdio(false);
	int n,i,j,Ans=0;
	double R,q,p;
	cin>>n>>R;
	const int Len=n;
	vector<double>x(Len);
	vector<double>y(Len);
	//vector<double>x,y;
	for(i=0;i<n;i++)
	{
		cin>>x[i]>>y[i];
		//x.push_back(p);
		//y.push_back(q);
	}
	for(i=0;i<x.size()-1;i++)
		for(j=i+1;j<x.size();j++)
		{
			/*double A,B,C,Dis;
			A=y[i]-y[j];
			B=x[j]-x[i];
			C=(y[i]*B+x[i]*A);
			Dis=(C*C)/(A*A+B*B);
			*/
			/*if(Dis>=R*R)
			{
			    Ans++;
				cout<<x[i]<<' '<<y[i]<<' '<<x[j]<<' '<<y[j]<<endl;
			}
			*/
			if(Dis(x[i],y[i],x[j],y[j])>=R*R)
				Ans++;
		}
	//Ans;
	cout<<Ans;
	return 0;
}
double Dis(double x1,double y1,double x2,double y2)
{
	//double Px1=double(x1),Py1=double(y1), Px2=double(x2),Py2=double(y2),A,B,C,Dis;
	double A,B,C,dis;
	A=y1-y2;
	B=x2-x1;
	C=(y1*B+x1*A);
	dis=(C*C)/(A*A+B*B);
	return dis;
}