import java.applet.Applet;
import java.awt.event.*;
import java.awt.*;
import java.awt.geom.*;

class ListenTriangle {
    double x1,x2,x3;
    double y1,y2,y3;

    ListenTriangle() {
      this.x1=x1;
      this.x2=x2;
      this.x3=x3;
      this.y1=y1;
      this.y2=y2;
      this.y3=y3;
    }
    
    int inside(Point p)
    {
	double v1x,v1y,v2x,v2y;
	double A1,A2,A3;
	int val;
	v1x=p.x-this.x1;
	v1y=p.y-this.y1;
	v2x=p.x-this.x2;
	v2y=p.y-this.y2;
	A3=v1x*v2y-v1y*v2x;
	v1x=p.x-this.x2;
	v1y=p.y-this.y2;
	v2x=p.x-this.x3;
	v2y=p.y-this.y3;
	A1=v1x*v2y-v1y*v2x;
	v1x=p.x-this.x3;
	v1y=p.y-this.y3;
	v2x=p.x-this.x1;
	v2y=p.y-this.y1;
	A2=v1x*v2y-v1y*v2x;
	val=0;
	if((A1<0)&&(A2<0)&&(A3<0)) val=1;
	if((A1>0)&&(A2>0)&&(A3>0)) val=1;
	return(val);
    }

}