N = int(input())
A, B, C = [2, 8], [3, 9], [7, 9]

for _ in range(N):
    xi1, yi1, xi2, yi2 = map(int, input().split())
    
    if A == [xi1, yi1]:
        A = [xi2, yi2]
    elif B == [xi1, yi1]:
        B = [xi2, yi2]
    elif C == [xi1, yi1]:
        C = [xi2, yi2]

if A == [5, 8] and B == [4, 8] and C == [6, 8]:
    print('YES')
else:
    print('NO')