#include <stdio.h>

int check(int x, int y, int cX, int cY, int R)
{
    //(x - center_x)^2 + (y - center_y)^2 < radius^2
    int checkX, checkY, nr;
    checkX = x - cX;
    checkY = y - cY;
    nr = 0;

    if((checkX*checkX + checkY*checkY) < R*R)
        nr++;
    else
       if((checkX*checkX + checkY*checkY) == R*R)
            nr++;

  return nr;
}

int main(void)
{
    int count, n, Cx, Cy, r, x, y;
    count = 0;

    scanf("%d %d %d %d", &n, &Cx, &Cy, &r);
    while(n > 0)
    {
        scanf("%d %d", &x, &y);
        count = count + check(x,y,Cx,Cy,r);
        n--;
    }
    printf("%d", count);
    return 0;
}