#include <stdio.h>
#include <string>
#include <iostream>
#include <cstdlib>
#include <cmath>
#include <stack>

using namespace std;

struct point {
    double x ;
    double y ;

};
double det;

point dot ( point A , point B , point C , point D) {
    point M;
    M.x = ((A.x * (A.y - B.y) + A.y * (B.x - A.x)) * (D.x - C.x) - (C.x * (C.y - D.y) + C.y * (D.x - C.x)) * ( B.x - A.x)) /  det ;
    M.y = ( - (A.x * (A.y - B.y) + A.y * (B.x - A.x)) * (C.y - D.y) + (C.x * (C.y - D.y) + C.y * (D.x - C.x)) * (A.y - B.y)) / det;
    return M;

}
int main()
{
    point A, B , C ,D;
    scanf("%lf%lf%lf%lf%lf%lf%lf%lf", &A.x , &A.y , &B.x , &B.y , &C.x , &C.y , &D.x , &D.y);
    if ( (A.x - B.x) * (C.y - D.y) - (A.y - B.y) * (C.x - D.x) == 0 ) {
        printf ("no1");
        exit (0);
    }
    if ((C.x * (A.y - B.y) + C.y * (B.x - A.x) - A.x * (A.y - B.y) + A.y * (A.x - B.x) > 0
         && D.x * (A.y - B.y) + D.y * (B.x - A.x) - A.x * (A.y - B.y) + A.y * (A.x - B.x) > 0)
        || (C.x * (A.y - B.y) + C.y * (B.x - A.x) - A.x * (A.y - B.y) + A.y * (A.x - B.x) < 0
           && D.x * (A.y - B.y) + D.y * (B.x - A.x) - A.x * (A.y - B.y) + A.y * (A.x - B.x) < 0)) {
        printf ("no2");
        exit (0);
    }
    det = - ((A.x - B.x) * (C.y - D.y) - (A.y - B.y) * (C.x - D.x));
    point M = dot( A, B, C, D);
    if ( ( M.x < A.x && M.x < B.x) || (M.y > A.y && M.y > B.y)) {
        printf ("no3");
    }
    else printf ("yes");
    return (0);




}