#define _USE_MATH_DEFINES
 
#include <iostream>
#include <iomanip>
#include <sstream>
 
#include <algorithm>
#include <cmath>
 
#include <string>
//#include <array>
#include <list>
#include <queue>
#include <vector>
#include <complex>
#include <set>
#include <map>
 
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
 
#define PII pair<int,int>
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////

vector<PII> vec(5);

int gai(PII a,PII b){
	return a.first * b.second - a.second * b.first;
}

bool solve(){
	//1-3 2,45
	PII pos[4];
	for(int i=0;i<5;++i){
		for(int j=0;j<4;++j){
			pos[j].first = vec[(j+i+1)%5].first-vec[i].first;
			pos[j].second = vec[(j+i+1)%5].second-vec[i].second;
		}
		int temp;
		temp = gai( pos[1], pos[0] );if( temp >= 0 ) return false;
		temp = gai( pos[1], pos[2] );if( temp <= 0 ) return false;
		temp = gai( pos[1], pos[3] );if( temp <= 0 ) return false;
	}
	return true;
}

int main(void){
    std::cin.tie(0); 
    std::ios::sync_with_stdio(false);
    std::cout << std::fixed;//
    cout << setprecision(16);//
	
	rep(i,5){
		cin >> vec[i].first >> vec[i].second;
	}
	int count = 0;
	while( count < 120 ){
		if( solve() ){
			P("YES");
			return 0;
		}
		next_permutation( vec.begin(), vec.end() );
		++count;
	}
	P("NO");
	return 0;
}