# -*- coding: utf-8 -*-
"""
Created on Sun Sep 26 17:30:25 2021

@author: 大翔
"""

a,b,c,d,e,f=map(int,input().split())
i=0
z=0
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=a
a=b
b=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=a
a=b
b=z
z=a
a=c
c=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=a
a=c
c=z
z=a
a=d
d=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=a
a=d
d=z
z=a
a=e
e=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=a
a=e
e=z
z=a
a=f
f=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=a
a=f
f=z
z=b
b=c
c=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=b
b=c
c=z
z=b
b=d
d=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=b
b=d
d=z
z=b
b=e
e=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=b
b=e
e=z
z=b
b=f
f=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=b
b=f
f=z
z=c
c=d
d=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=c
c=d
d=z
z=c
c=e
e=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=c
c=e
e=z
z=c
c=f
f=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=c
c=f
f=z
z=d
d=e
e=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=d
d=e
e=z
z=d
d=f
f=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
z=d
d=f
f=z
z=e
e=f
f=z
if a < b and b > c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if a > b and b < c:
    if d < e and e > f:
        i=1
    if d > e and e < f:
        i=1
if i == 0:
    print("Yes")
else:
    print("No")