#include <iostream>
#include <math.h>
using namespace std;
 
int main() {
      double a, b, c, d, e, f, g, h; /*Описание переменных для хранения входных данных. a, b, c, d, e, f, g, h - координаты точек плоскости.*/
      double f1, f2; //Описание формул, для нахождения координат точек.
      scanf("%lf %lf %lf %lf %lf %lf %lf %lf", &a, &b, &c, &d, &e, &f, &g, &h); //Чтение из стандартного потока. 
      // f=(x-e)(h-f)-(y-f)(g-e) - уравнение прямой.
      f1=(a-e)*(h-f)-(b-f)*(g-e); //Подставляем в f(x,y) точку (a,b)
      f2=(c-e)*(h-f)-(d-f)*(g-e); //Подставляем в f(x,y) точку (c,d)
      if (f1>0 && f2>0 || f1<0 && f2<0)
      printf("Yes");
      else
      printf("No");
      return 0;
}

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MwoxNTQ1CjM0NTUKNAo0Mgo2NTYsMQozNTQ1CjEsNTY=

3
1545
3455
4
42
656,1
3545
1,56