#include <cstdio>
#include <algorithm>

using namespace std;

int main ()
{
  //  freopen ("file.in", "r", stdin);

    int n, x, y, r;
    scanf ("%d %d %d %d", &n, &x, &y, &r);

    int rez = 0;
    for (int i = 1; i <= n; ++i)
    {
        int a, b;
        scanf ("%d %d", &a, &b);

        if ((a - x) * (a - x) + (b - y) * (b - y) <= r * r)
            ++rez;
    }

    printf ("%d\n", rez);

    return 0;
}