#include <iostream>
using namespace std;

int main()
{
    int n,r,x1,y1,sum=0,x,y;
    cin>>n>>x>>y>>r;
    r=r*r;
    while(n!=0)
    {
        cin>>x1>>y1;
        if(r>=(x-x1)*(x-x1)+(y-y1)*(y-y1))
            sum++;
        n--;
    }
    cout<<sum;
    return 0;
}