from collections import *
from itertools import *
from functools import *
from heapq import *
import sys,math
input = sys.stdin.readline

A = list(map(int,input().split()))
def zip_coordinate(x):
    
    #1,2,3,~
    tx = list(set(x))
    tx.sort()
    d = {tx[i]:i for i in range(len(tx))}
    return [d[i] for i in x]
A = zip_coordinate(A)

X = len(set(A))
for i in range(1<<X):
    
    tmp = [0]*X
    for j in range(X):
        if (i>>j)&1:
            tmp[j]=1
    
    if ~((~((~(tmp[A[0]]&tmp[A[1]]))&(tmp[A[2]])))&(~((~(tmp[A[3]]&tmp[A[4]]))&(tmp[A[5]])))):
        print('YES')
        exit()
print('NO')