package main import ( "bufio" "fmt" "os" "sort" "strconv" ) func out(x ...interface{}) { fmt.Println(x...) } var sc = bufio.NewScanner(os.Stdin) func getInt() int { sc.Scan() i, e := strconv.Atoi(sc.Text()) if e != nil { panic(e) } return i } func getInts(N int) []int { ret := make([]int, N) for i := 0; i < N; i++ { ret[i] = getInt() } return ret } func getString() string { sc.Scan() return sc.Text() } // min, max, asub, absなど基本関数 func max(a, b int) int { if a > b { return a } return b } func min(a, b int) int { if a < b { return a } return b } func asub(a, b int) int { if a > b { return a - b } return b - a } func abs(a int) int { if a >= 0 { return a } return -a } func lowerBound(a []int, x int) int { idx := sort.Search(len(a), func(i int) bool { return a[i] >= x }) return idx } func upperBound(a []int, x int) int { idx := sort.Search(len(a), func(i int) bool { return a[i] > x }) return idx } func main() { sc.Split(bufio.ScanWords) sc.Buffer([]byte{}, 1000000) N := getInt() var a [9][9]int a[1][7] = 1 a[2][8] = 2 a[6][8] = 3 for i := 0; i < N; i++ { x1, y1, x2, y2 := getInt()-1, getInt()-1, getInt()-1, getInt()-1 a[x2][y2] = a[x1][y1] a[x1][y1] = 0 } if a[4][7] == 1 && a[3][7] == 2 && a[5][7] == 3 { out("YES") return } out("NO") }