from heapq import heappop, heappush
N, K = map(int, input().split())
A = list(map(int, input().split()))

q = [-a for a in A[::-1]]
cl = []
while 0 < len(q) <= 1000:
    a = heappop(q)
    if a == -1:
        print("No")
        exit()
    elif a > -1:
        print("Yes")
        exit()
    p = []
    for a2 in q + cl:
        if abs(a2-a) in [1, 3, 5]:
            p.append(((a2+a)//2)+4)
    for a2 in p:
        heappush(q, a2)
    cl.append(a)
if q:
    print("No")
else:
    print("Yes")