#include<string>
#include<vector>
#include<iostream>
#include<sstream>
#include<cstdio>
#include<cstdlib>
#include<functional>
#include<algorithm>
#include<stack>
#include<queue>
#include<deque>
#include<set>
#include<map>
#include<utility>
#include<cmath>
#include<ctime>
#include<complex>

using namespace std;

#define REP(i,s,e) for(int i=int(s);i<=int(e);i++)
#define rep(i,n) for(int i=0;i<int(n);i++)


int main(){

	while(true){

		double xa,ya,xb,yb,xc,yc,xd,yd;
		cin >> xa >> ya >> xb >> yb >> xc >> yc >> xd >> yd;
		if(cin.fail()) break;

		double a1=ya-yc;
		double b1=xc-xa;
		double c1=ya*(xa-xc)-xa*(ya-yc);
		double a2=yb-yd;
		double b2=xd-xb;
		double c2=yb*(xb-xd)-xb*(yb-yd);

		if((a1*xb+b1*yb+c1)*(a1*xd+b1*yd+c1)>0 && (a2*xa+b2*ya+c2)*(a2*xc+b2*yc+c2)<0) cout << "NO" << endl;
		else if((a1*xb+b1*yb+c1)*(a1*xd+b1*yd+c1)<0 && (a2*xa+b2*ya+c2)*(a2*xc+b2*yc+c2)>0) cout << "NO" << endl;
		else if((a1*xb+b1*yb+c1)*(a1*xd+b1*yd+c1)<0 && (a2*xa+b2*ya+c2)*(a2*xc+b2*yc+c2)<0) cout << "YES" << endl;

	}

	return 0;
}