package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
	"strconv"
)

var sc = bufio.NewScanner(os.Stdin)
var wr = bufio.NewWriter(os.Stdout)

func out(x ...interface{}) {
	fmt.Fprintln(wr, x...)
}

func getI() int {
	sc.Scan()
	i, e := strconv.Atoi(sc.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func getF() float64 {
	sc.Scan()
	i, e := strconv.ParseFloat(sc.Text(), 64)
	if e != nil {
		panic(e)
	}
	return i
}

func getInts(N int) []int {
	ret := make([]int, N)
	for i := 0; i < N; i++ {
		ret[i] = getI()
	}
	return ret
}

func getS() 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
}

var m map[int]bool
var N, K int

func main() {
	defer wr.Flush()
	sc.Split(bufio.ScanWords)
	sc.Buffer([]byte{}, 1000000)
	// this template is new version.
	// use getI(), getS(), getInts(), getF()
	N, K = getI(), getI()
	a := getInts(K)
	sort.Ints(a)

	m = make(map[int]bool)
	for i := 0; i < K; i++ {
		m[a[i]] = true
	}

	ng := false
	for i := 0; i < K; i++ {
		for p := 1; p <= 6; p++ {
			start := a[i] - p
			if m[start] {
				continue
			}
			if start <= 0 {
				continue
			}
			pos0 := a[i]
			pos1 := start + 7 - p
			if m[pos0] && m[pos1] {
				// out("!!!")
				if m[pos0-7+p] {
					ng = true
				}
			}
			// out(a[i], p, "start", start, "to", pos0, pos1)
		}
	}

	if !ng {
		out("Yes")
		return
	}
	out("No")
}