#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000000000
	

int main(){	
	
	vector<pair<int,int>> xy(5);
	rep(i,5)cin>>xy[i].first>>xy[i].second;
	
	sort(xy.begin(),xy.end());
	long long smin = Inf;
	do{
		long long temp = 0;
		rep(i,5){
			int a = i;
			int b = (i+1)%5;
			int c = (i+2)%5;
			temp += (xy[a].first-xy[b].first)*(xy[a].first-xy[b].first) + (xy[a].second-xy[b].second)*(xy[a].second-xy[b].second);
		}
		smin = min(smin,temp);
		//return 0;
	}
	while(next_permutation(xy.begin(),xy.end()));
	//cout<<smax<<endl;
	sort(xy.begin(),xy.end());
	
	do{
		bool f = true;
		long long temp = 0;
		rep(i,5){
			int a = i;
			int b = (i+1)%5;
			int c = (i+2)%5;
			if((xy[a].first-xy[b].first)*(xy[c].second-xy[b].second) - (xy[c].first-xy[b].first)*(xy[a].second-xy[b].second)<=0)f = false;
			temp += (xy[a].first-xy[b].first)*(xy[a].first-xy[b].first) + (xy[a].second-xy[b].second)*(xy[a].second-xy[b].second);
		}
		if(f&&temp==smin){
			cout<<"YES"<<endl;
			return 0;
		}
	}
	while(next_permutation(xy.begin(),xy.end()));
	cout<<"NO"<<endl;
	return 0;
	
}