s  =   [[2, 8], [3, 9], [7, 9]]
goal = [[5, 8], [4, 8], [6, 8]]

n = int(input())
xy1 = []
xy2 = []

for i in range(n):
    xi1, yi1, xi2, yi2 = map(int, input().split())
    xy1.append([xi1, yi1])
    xy2.append([xi2, yi2])


for i in range(n):
    if xy1[i] not in s:
        s.append(xy1[i])
    s[s.index(xy1[i])] = xy2[i]

if s[0:3] == goal:
    print('YES')
else:
    print('NO')