#!/usr/bin/python
# -*- coding: utf-8 -*-
# †
# (ΦωΦ)＜
# 交点が5つあるかどうかでいいですか?
from collections import namedtuple
Point = namedtuple('Point', 'x, y')

xys = []
for _ in xrange(5):
    x, y = map(float, raw_input().split())
    xys.append(Point(x, y))

from itertools import permutations
from itertools import izip, tee, islice
def pairwise(iterable):
    "s -> (s0,s1), (s1,s2), (s2,s3), ..."
    a, b = tee(iterable)
    next(b, None)
    return izip(a, b)

for x in permutations(xys):
    x = list(x)
    y = x + [x[0]]
    sett = set()
    for i in xrange(5):
        a, b, c, d = (i+1)%5, (i+2)%5, (i+3)%5, (i+4)%5
        a, b, c, d = x[a], x[b], x[c], x[d]
        bunbo = (b.x - a.x) * (d.y - c.y) - (b.y - a.y) * (d.x - c.x)
        if bunbo == 0:
            continue
        ac = Point(c.x - a.x, c.y - a.y)
        dr = ((d.y - c.y) * ac.x - (d.x - c.x) * ac.y) / bunbo
        if 0 < dr < 1:
            px = a.x + dr * (b.x - a.x)
            py = a.y + dr * (b.y - a.y)
            sett.add(Point(px, py))
#    print sett
    if len(sett) == 5:
        print 'YES'
        exit(0)
print 'NO'