import java.util.*;


/**
 * written by me on August 26
 * @author ola
 *
 */

public class CirclesCountry { 
	
	/**
	 * Return true if (px,py) is inside circle x,y,r
	 * @return
	 */
	public boolean isInside(int x, int y, int r, int px, int py){
		double distance = Math.sqrt((px-x)*(px-x) + (py-y)*(py-y));
		return distance < r;
//		if (distance < r) return true;
//		return false;
	}
	
	public int leastBorders(int[] x, int[] y, int[] r, 
					        int x1, int y1, int x2, int y2) {
		
		int p1 = 0;
		for(int k=0; k < x.length; k++){
			boolean b1 = isInside(x[k],y[k],r[k],x1,y1);
			boolean b2 = isInside(x[k],y[k],r[k],x2,y2);
			if (b1 != b2){
				p1++;
			}
		}
		
		return p1;
	}
}