#include <math>

using namespace std;

//dlina mezhdu tochkami na koordinatnoy pryamoy
long long lenth (int x1,int y1,int x2,int y2){
	int t1=x1-x2;
	int t2=y1-y2;
	return sqrt(pow(t1,2)+pow(t2,2));
}

//ploshad' treugol'nika
long long squaretr(int x1,int y1,int x2,int y2,int x3,int y3){
	int t1=x2-x1;
	int t2=y3-y1;
	int t3=x3-x1;
	int t4=y2-y1;
	t1=(t1*t2)-(t3*t4);
	t1/=2;
	if(t1<0){t1*=-1;}
	return t1;
}

//nahoditsya li tochka v treugul'nike
int pointintriangle (int x1,int y1,int x2,int y2,int x3,int y3,int x4,int y4){
	if((squaretr(x1,y1,x2,y2,x4,y4)+squaretr(x1,y1,x3,y3,x4,y4)+squaretr(x2,y2,x3,y3,x4,y4))==squaretr(x1,y1,x2,y2,x3,y3)){return 1;}
	return 0;
}