n = int(input())
a = [[2, 8], [3, 9], [7, 9]]
for i in range(n):
    x, y, x2, y2 = map(int, input().split())
    for j in range(3):
        if a[j] == [x, y]:
            a[j] = [x2, y2]
if a == [[5, 8], [4, 8], [6, 8]]:
    print('YES')
else:
    print('NO')